our final stop today is in greenwich, connecticut. this home, which dates back to 1840, sits on nearly five acres of lush land. the owners have spent several years renovatidg to keep the best of its historic elements, while adding modern day amenities, to create the ultimate dream home. [music playing] hi. i'm b.k. bates. i'like to welcome you to greenwich, connecticut. this is the benjamin reynolds house. and i'm very excited to show you around. the benjamin reynolds house was originally built in 1840. it has fabulous detailing, wide plank floors, high ceilings, great charm. everything behind this imported door has been added since 2002. you can clearly see how the new addition

[music playing] front entryway opens to a formal living room and formal dining room. both of these rooms are spacious, have great light. and each one has a fireplace. these are the kinds of rooms you would expect to see in a prewar home. as y continue through the home, you're going to see some very unexpected surprises. the adirondack room is one of those surprises. this room was originally developed in 1920. and what's so striking about it is its authenticity. everything in this room is original, the floors, the beams, theassive fireplace. this is really the heart of the home for this family one thing you may notice that is not original 1920 is the projector. the family installed it so they can enjoy this room as a home theater. this open floor plan represents how families live today. kitchen opens to the dining area and family room. the family room incorporates even more of the home's

it has an outstanding vaulted beamed ceiling, with the unique feature of a cupola trimmed with copper. this room, along with the kitchen and dining area, brings a touch of modern to this lovely country setting. speaking of a country setting, these freh doors take your outside to a beautiful brick patio, with built-in grill and covered terrace. [music playing] this master bedroom suite, with its beamed cathedral ceiling, is both spacious and cozy at the same time. it features two large dressing rooms and a luxurious, spa-like bathroom. i'm here on the master balcony. you can see it all. the lake spans before you. and the size of the property reveals itself. we have one more surprise. the original horse barn has been converted into a basketball court. that's one of the many surprises i hope you've enjoyed today. thank you so much for coming up greenwich and taking this tour with me. that's all for now.

the most inspiring rooms combine old and new pieces. it's modern. it's fresh. and it creates the impression of having been collected over time. if you have a decorating tip, share it with us on twitter or instagram @openhousetv. and you can also join our facebook family. and if you want to see more of the amazing homes we featured on today's show, head to openhousetv.com. we'll be back next week. thanks for watching.

a go >> reporter: at 5:53 a.m., a security camera captured michelle's car as it arrived at the parking lot. she stopped by the warehouse's time clock and headed upstairs to her office. about an hour later, a supervisor named ed yuska noticed a big stain on the upstairs hallway carpet. he started looking around the area, with help from a co-worker, the janitor, david dooley. >> ed was out on the mezzanine just part of the ways, and i was holding the door. and there was just -- he said, there's a dead body laying there. >> reporter: what did it look like? >> i just saw from the knees

i didn't see the whole thing. but honestly i'm glad i didn't look because i'd never been around anything like that. it was kind of frightening f me. >> reporter: someone inside thermo fisher had killed michelle mockbee. but who? and just as puzzling, why? >> when we come back, lockdown. the hunt for a killer begins. >> the perpetrator could still be there. >> in this giant warehouse, a giant question -- had someone carried out the perfect crime? >> there's actually industrial strength bleach there. rubber gloves everywhere. if you neeeed to commit a murder, this place had it. does your carpet ever feelough and dirty? don't avoid it, resolve it. our formula with a special conditioning ingredient, softens your carpet with every use. it's r rolve, so you know it cleans and freshens. but it also softens. resolve.

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>> reporter: tuesday morning after memorial day deputieiefrom the boone county sheriff's department resnded to a call of a person down at the thermo fisher warehouse. they rolled up to the front door and were directed upstairs. deputy joe gregory was with them. >> we went over to the victim, assessed that she was dead. there was plastic wrapped around her head. there was plastic wrap around the back of her hands. >> reporter: the deputies did a tactical search of the area to secure it. >> you definitely have your guns drawn because the perpetrator could still be there. >> reporter: there was no sign of anyone upstairs, but the csi

found hints of what had happened. a trail of blood in the hallway. a larger blood stain showing smears when lit up, as though someone had attempted a clean-up. the body itself was found in an unused mezzanine area where someone had also stashed michelle's purse and a bag holding employee time cards. >> obviously we felt like the body had been moved. >> reporter: putting the story together was now the job of lead investigators bruce mcvay and everett stahl. tell me a little bit about the building where this takes place. >> thermo fisher scientific is a company that ships medical supplies. kind of like an amazon for medical supplies. it's a large warehouse. >> reporter: how large? try the size of four football fields. that's ulcer-inducing acreage for an investigator searching for clues. but on the plus side, the warehouse was also a secure facility. deteives say it's pretty hard

employee. so you know that your suspect is one of those people in the building? >> that's right. >> reporter: the sheriff's department put thermo fisher on lockdown. no one allowed in or out. deputies took a head cnt. there were 13 workers on site. detectives began interviewing them one by one. >> i'm sitting actually closer the people that i'm interviewing. and i can see with each person i talk to, there's no blood, there's no evince that they have been involved in anything. >> reporter: if it's one of the people you're interviewing, they've disguised it well? >> they have. >> reporter: dan mockbee says back at home, he started hearing about an incident at the warehouse. >> they weren't letting people into the building. they were turning them away. >>eporter: dan says he tried calling his wife and other co-workers, but no one was picking up. >> and that's when i started getting nervous. >> reporter: he drove over and

stahl. >> everett stahl sat me down at a table and started to ask me a few questions. and i looked at him and i said "excuse me, officer. my wife works here. i really need to know that she's all right." and that's when he told me that she was deceased. >> his reaction was pretty excruciating to watch. i still had to press on, and i still had to move forward with my looking at him as a possible suspect. >> reporter: while dan mockbee was being questioned, michelle's family was starting to get word from the scene. >> i think i threw the phone down. and i'm just like no, no, this isn't happening. this isn't real. lockdown at the warehouse was lifted. >> i had each person walk through their day and it seemed like a normal day for everybody. nobody stood out. >> reporter: and then, every thermo fisher employee was sent home.

their first major sweep of the building, they were puzzled. >> there was really nothing out of place in this facility. after all the searching, the offices, the warehouse, there was just nototng. >> reporter: it didn't help that thermo fisher's shelves seemed perfectly stocked for a criminal. >> this is a company that has tyvek suits, which are what you would see in some murder investigations the detectives wearing, so they don't contaminate scenes. there's actually industrial strength bleach there. >> reporter: that's stronger than any you could buy in a store. >> that's right. rubber gloves everywhere, plastic bags. i mean, if you needed to commit a murder, this place has it. >> reporter: the only sign of anything amiss in the entire warehouse? michelle, as head of payroll, had a locked office, and it looked as though someone had tried to break into it. you could tell that because? >> there were pry marks on her office door.

office that anybody would want? >> that's the mystery. you know, we talked about money, but there was very little money if any at all. >> reporter: the following morning, thermo fisher employees came back on the job, shell-shocked about the death of their co-worker and jittery about possibly working alongside her killer. at a command center meeting at the sheriff's office, detectives put their heads together and drew up a list of potential suspects, based on the last people to see michelle mockbee alive, or the first to find her dead. ed yuska, the supervisor. >> he was one of the two that found the body. >> reporter: dave dooley, the janitor. >> dave dooley was with ed yuska when the body was found. >> reporter: doug tungate, a temp employee, and joe siegert, a warehouse worker. >> doug tungate and joe siegert were the two that saw michelle when she came in.

>> of course, dan mockbee because 's the husband. >> reporter: a short list of potential suspects for prosecutor linda tally smith. >> i've referred to this case as almost being like the game of clue because you have a very small group and it's a matter of accounting backwards and excluding people. >> reporter: so that's what faced investigators. in which room? with what weapon? and finally, who? coming up -- the questions begin. where was michelle's husband dan the morning of the murder? >> i was sleeping. what a great alibi, right?

couch and she sleep on the bed? >> reporter: michelle mockbee's siblings remember her as the big sister who literally couldn't lose. >> she was the contest queen. she won every contest there was for like a two-year run. >> yeah. you name it. she won tvs. flat screen tvs.

cards, you know, everything. >> super bowl parties. >> lucky. >> she loved it. it made her so happy. and it made her even more happy to share her winnings with other people. >> reporter: but now it was michelle's family that had lost so much. >> we were completely dumbfounded as to why anyone would want to hurt her. >> reporter: as investigators worked through their list of five initial suspects, one by one, like the prosecutor's game of clue, they started at the most obvious square one, the victim's husband. first couple of days police weren't letting you out of their sight. >> no. >> reporter: were you worried you'd be put in jail? >> absolutely. you know you're as innocent as can be, but there's always a possibility of something. >> reporter: dan was a suspect almost from the get-go. were you guys aware of that? >> i was aware of it. because the detective that came to my house asked me if there was any trouble in their marriage. to which i replied no, not at all. i not for one second thought that dan would be responsible ever.

never. >> reporter: but detectives weren't so sure. they peppered dan with questions. including the big one. when police asked you where you were at the time your wife was killed -- >> i was doing what most sensible people are doing at 6:00 in the morning if they don't have to get up and go to work. i was sleeping. what a great alibi, right? i'm home in bed. it's not a very good alibi, but it's the only one i had. >> reporter: but exactly where he was sleeping that night raised a red flag for detective stl. dan volunteered he was downstairs on the couch. was that a sign of trouble in the marriage? >> i said, "well, why'd you sleep on the couch andhe sleep in the bed?" and he said, "well, you know, typically the girls sleep with her and i get off of my shift late. by the time i get home, she's already in bed for the next day." so he had just made a habit to sleep in on the couch. it made us want to take a closer look at dan.

the only ones interested in the husband. a cadaver dog named little joe had been called in to search outside the warehouse. the dog searched two cars with no success, but then he went up to a third vehicle, a silver minivan. >> the dog did have some` interest in the back of that vehicle. >> reporter: detectives knew what the dog handler didn't, that the silver minivan belonged to dan mockbee. >> after the dog's up in the vehicle searching, he was finding nothing. there was no findings of human remains or blood. >> reporter: a disappointing dead end. >> investigators have been in and out of this place all day long. >> reporter: but the cadaver dog was then sent over to the mockbee house to join a search in progress. one dan had consented to. >> whatever we asked of dan, he was willing to do. >> reporter: suggesting either that he wasn't guilty or that he was supremely confident he wasn't going to get caught? >> that's right. >> reporter: while dan was feeling the heat, detectives

michelle's cell phone and tracking down truckers who had delivered to thermo fisher. and of course, stahl and mcvay were taking a hard look at the other four names on their initial suspect list. two men who were the last known to see michelle mockbee alive. one, a warehouse worker named joe siegert, had seemed unusually unemotional about michelle's death when he was first questioned. >> he was one of the ones that made it to the top of the list. >> joe presents himself as a loner. kind of a dry, dark sense of humor and personality. >> reporter: the other guy at the time clock that morning was doug tungate. doug was a temporary employee. a newcomer to thermo fisher and an outsider. >> we started looking into his past. saw that he had a couple felonies and some alcohol issues. so we thought, this might be a good guy to look at. >> reporter: then there was david dooley, the janitor. he and his wife janet had cleaned at thermo fisher for

david was one of the two to find michelle's body. >> detective mcvay interviewed him the day of the homicide, and really nothing that put him to the forefront t anyone's mind. >> reporter: and last, there was ed yuska. he was the supervisor who called 911 after finding michelle. >> the blood is right by her office door. it looks like she never got in her office. >> reporter: detective stahl found out that ed yuska had some health issues. >> the thought that ed could do all this to michelle, drag her down the hallway a get her to the mezzanine logically to us says ed's not our guy because he physically probably couldn't have done that. >> reporter: which made detectives feel comfortable eliminating ed yuska from their suspect list. and so then there were four. now, h/w to rule out the next one? the csi team had collected some dna from michelle's body and

it would be months before a forensic lab could report whetr any suspect was a match. meanwhile, investigators were starting to scan through a promising new piece of evidence, security video from the warehouse's parking lot. could the clue they needed be somewhere in those thousands of frames of footage? >> there it is. coming up -- >> it was nerve-racking. >> another elimination round. this time the lie detector test. and police soon detected something was up. >> he stops himself at the door and says, no, no, no, i'm not doing this. even if she gets a stain she'll wear it for a week straight. so i use tide to get out those week old stains and downy to get it fresh and soft. and since i'm the one who has to do the laundry, i do what any expert dad would do. i let her play sheriff. i got 20 minutes to life.

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mother of two michelle mock bee's family -- funeral brought her family some comfort. >> in ur mind, you're like, she touched this many people's lives. >> soon red ribbons popped up in honor of michelle. but still couldn't answer the family's questions. >> i feel like we're kind of in limbo. >> we didn't know what this was all about. we didn't know if it was somebody after our fakily, why they would be, we don't know. >> early on, the investigation had yielded frustratingly few clues on the four remaining lead suspects, but the detective's commander kept up hope. >> i knew once we can get that just one little bit of lead on this investigation it would open, many, many doors. >> hov and his team of detectives were hunting for the

hours of security footage of the thermofisher parking lot. >> we had several eyes on this video. >> and stahl decided to turn up the heat on the four, starting with the husband, dan. >> we asked him, would you take a polygraph for us? >> you agreed to take the polygraph. >> yes, sir. that's a scary thing. >> because if it goes wrong, all of a sudden there's a case against you. >> right. it was nerve-wracking. i mean, i took a deep breath like this an the guy's like hold on, hold on. you can't do that. you know, it's registering on the sensors. and you're like what if i took a deep breath at the wrong time? >> reporter: but dan told detectives he was eager to be put under the microscope. >> please. do all this stuff so you can figure out that i have nothing to do with this so you can go find whoever did this. >> reporter: dan mockbee passed the polygraph. and this time, the husband didn't'to it. and so then there were three. and around that time, mar huff and his team spotted something

security footage. >> there it is. >> reporter: a vehicle in the parking lot, not entering, but leaving, around the back of the building. >> a bright red, fire engine red, chevy pick-up truck, two-door. that's not a normal route for any employee to take. reporter: detectives matched the truck to its owner, david dooley, the janitor. >> dave dooley's truck is seen leaving the parking lot at 6:31 that morning. >> reporter: right after the murder? >> that's right. that's right. >> reporter: and detectives could tell from the security tape that dooley had returned to the warehouse around 7:00 a.m., in time to be with ed yuska when he discovered michelle's body. detectives went to the apartment david dooley shared with his wife janet to ask where he went during that half-hour trip. >> they got there at 6:00 -- about 6:30 in the evening. and i kind of figured it would happen just to do a follow-up. >> he told me why he left the building. that he was trying to call his wife.

>> my wife does take ambien to help her sleep at night and i went home to check on her, make sure she was okay. >> reporter: his wife, janet, id her husband often worried about her health and would check in on her. >> he drives me crazy with, janet, did you take your medicine? janet, didou take your vitamins today? that's just the kind of person he is. he's a very sweet guy, a loving guy. >> reporter: but detectives wondered, did he really come home to check on his wife? or to get rid of evidence? >> we started working on a search warrant for the residence and for the truck. >> reporter: you execute those search warrants and you find bloody clothing? >> no bloody clothing. >> reporter: bloody foot prints? >> no. >> reporter: stuff taken from the crime scene that shouldn't be at the house? >> no. >> reporter: some kind of murder weapon? >> no. >> reporter: are you thinking now, okay, maybe this isn't the guy? >> while they're searching the house, they collected some clothing, and then, just some other odds and ends. but nothing that directly tied michelle mockbee to him.

kept working. they asked two other suspects, joe, the warehouse worker, and doug, the temp employee, to ta polygraphs. both men agreed. both passed. two more names scratched off the list. detectives had also asked david dooley to take a polygraph. >> and he said, "yeah, i'll take one." >> reporter: but when they brought him down to headquarters -- >> we walk h h in, and detective mcvasays, "this is our polygraph operator." and he stops himself ad the door and says, no, no, no, i did not agree to that. i did not agree to this. i'm not doing this. >> there was no asking me to do it. it was sit down and do it. i said, well i want to do this with an attorney. >> reporter: dooley didn take a polygraph at a later time either, but he says that wasn't his fault. >> i did offer to take the polygraph, and they said it's too late. >> reporter: over the next few months, detectives focused in on dooley.

was the only one they could ever identify who left the building around the time michelle mockbee was killed. after eliminating other suspects, detectives now believed they'd cracked the case. in september 2012, the boone county sheriff's department arrested david dooley. >> just very glad he's behind bars. that's where he needs to be. as to why this happened, we have no idea. >> reporter: and then there was one. >> i didn't know what to say. i didn't know what to do. i was never going home. >> reporter: you want to stop a minute? >> it's fine. i knew i was never going home, and i was upset. >> reporter: did you tell them they had the wrong guy? >> yeah, i did. >> reporter: didn't do any good? >> no. >> reporter: but then, the long-awaited results from the dna found at the crime scene came back from the forensic lab. it turned out, david dooley was

and in the local media, janet called for him to be freed. >> we've been telling everyone he didn't do this. nobody deserves to be accused of a crime of this magnitude without something to prove that he did it. >> reporter: but even without forensic evidence tying david dooley to the crime, prosecutor linda tally smith remained confident, deciding to move forward with the c ce. in september 2014, david dooley went on trial for murder. >> the truth is, there is no smoking gun. there is no one fingerprint. there's no eyewitness. >> so what did the prosecutor have on david dooley? coming up -- >> our belief has always been that david dooley was in the middle of breaking into her office when she came up the steps and surprised him. >> a break-in?

he have managed a spotless escape? >> got a clean pair of jeans. clean shoes. >> when "dateline" continues. well the squirrels are back in the attic. mom? your dad won't call an exterminator... can i call you back, mom? he says it's personal this time... if you're a mom, you call at the worst time. it's what you do. if you want to save fifteen percent or more on car insurance, you switch to geico. it's what you do. where are you? it's very loud there. are you taking a zumba class? recently we've noticed some ads created by these two birds, inviting you to stay away from the streak free shine of windex. well dear windex users these ads are false. sfx: squeaks from window cleaning clean glass is better than dirty glass. don't stand for dirty. use windex. so how ya doing? enough pressure in here for ya? ugh. my sinuses are killing me. yeah...just wait 'til we hit ten thousand feet. i'm gonna take mucinex sinus-max. too late, we'r'rabout to take off. these dissolve fast. ey're new liquid gels.s. and you're coming with me... wait, what?! you realize i have gold status?

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my men driven nearly mad from starvation and frostbite. today we make history. >>bienvenidos! welcome to the south pole! you're dora the explorer, you explore. >>what took you so long? if you want to save fifteen percent or more on car insurance, you switch to geico. it's what you do. >>you did it, yay! >> reporter: michelle mockbee's favorite color had always been red, and since her death her family has worn red in her honor. you're all wearing your red wristbands today. >> yes. they say, "michelle ann mockbee, in our hearts.

>> reporter: that was your idea? >> yes. just a little something to remember her by. >> reporter: there was a sea of red each day, as michelle's family and supporters flowed into this northern kentucky courthouse where david dooley faced trial for her murder. >> on may the 29th of 2012 dan mockbee st the love of his life, and two little girls los their mom at the hands of a man who couldn't even keep his story straight from one day to the next. >> reporter: prosecutor linda tally smith began by telling the jurors they wouldn't hear about any smoking gun, but they would hear david dooley's own words which she said had made him the last man standing in the detectives' process of elimination. >> it was through this process that the path kept turning back

david dooley. >> reporter: the prosecutor explained that at thermo fisher, warehousemployees used hand-held scanners like this one on the job, and the scanner data coulhelp locate where employees were around the time of the murder. >> we were able to create, pretty much so, a time record of where everybody was and what they were doing at different points during the morning. >> reporter: jurors heard that almost all the employees were working on the warehouse floor, far away from the upstairs office area where michelle was killed. but where was david dooley? because he was the janitor, he didn't use a scanner. which meant, said the prosecutor, he could have been upstairs near michelle's office during that critical time. david dooley was captured on security video that morning. >> there's the red pickup truck. >> repter: his red truck was seen leaving the thermo fisher parking lot. >> the defendant actually left

a.m., which was about a half hour after michelle walked into the building. >> reporter: the prosecutor filled in what she believed happened between the time michelle mockbee arrived and when david dooley left. >> she entered the warehouse, gathered the time cards from the time clocks and headed upstairs into the offices to do her work. >> reporter: the prosecutor showed the jury a photo of fresh pry marks on michelle's office door, which she said indicated an attempted break-in. michelle, you'll remember, had come in earlier than usual that morning. >> our belief has always been that david dooley was in the middle of breaking into her office when she came up the steps and surprised him. and ultimately she was assaulted and restrained. >> reporter: because she was a witness the a crime in progress? >> absolutely. >> reporter: the medical examiner said michelle was bludgeoned to death with something similar to an industrial packing tape gun. but after such a violent attack,

found on david dooley? and why wasn't any of his dna left at the scene? the prosecutor argued that's because the janitor worked every day with cleaning supplies and plastic bags. perfect for removing evidence of a crime. >> at the time david dooley attacked michelle in that hallway what did he have with him? a rolling crime scene clean-up cart with a trash bag in the middle of it. >> it's my personal belief that when he left that building he took with him a bag containing all of the evidence that was missing from the scene. >> reporter: but you never found any of that stuff? >> never found any of it, no. >> reporter: and once dooley was back at the warehouse, detectives recalled, he looked noticeably fresh. >> this guy's the janitor, but he's really clean. he's got a clean@pair of jeans, clean shoes. >> reporter: a cover-up so spotless only a janitor could manage it, said the prosecutor.

that was a mess. >> it's very hard for a person to explain how they can't tell the same story twice. and in these circumstances we had four separate statements from him. and he never told the same story twice. >> reporter: detective mcvay testified it was what dool didn't say in his first interview on the day of the murder that made them take a hard look at him. >> at any time did he tell you that he left that building? >> no, he did not. >> during that first interview, did he tell you that he was one of the people who found michelle mockbee's body? >> no, he did not. >> reporter: mcvay says it was only in dooley's second interview at his apartment that he first mentioned leaving work and going home. >> and i came back here. >> okay. what time did you come back here? >> 6:30. i couldn't get hold of my wife. i came home to make sure she was ok. >> reporter: but detective stahl says dooley's wife janet told stahl something different. >> i ask her specifically if dave ever came home that morning, and she says no. >> reporter: in a later set of

did say david did come home to change a pair of ripped pants. >> he had to come home and, you know, just grab a pair of pants. >> reporter: it sounds like an alibi. except david dooley adamantly denied doing that. >> i never said that. >> okay. you didn't rip your pants? >> no. >> reporter: however, jurors heard that a warehouse co-worker also remembered dooley talking to him the morning of the murder about ripped pants. >> he had a conversation in which he said that he had to go home and change his clothes because he had ripped his pants. >> reporter: while the prosecutor had focused on david dooley's own words and that suspicious drive away from the murder scene, next the defense was about to point out to the jury all the hard evidence investigators didn't have on david dooley. >> dna evidence, murder weapon, blood evidence, marks on david dooley. >> reporter: and the defense

more of a reason to want michelle dead. coming up -- >> did you have anything to do with the death of michelle mockbee? >> no, i did not. i did not kill her. >> mystery dna. possible intruder? a husband on the stand. so many questions.

prosecut_r. >> reporter: jurors had listened for twelve days as prosecutors laid out a very circumstantial case against david dooley. so circumstantial that his defense attorneys chris roach and tom pugh say they sometimes wonder why dooley was even on trial. >> we were trying to figure out exactly what they were saying

all. the one thing that we could see that was bad for him at that point was just that he went home that day. >> reporter: in court prosecutors had focused on that trip home and, according to detectives, that dooley never mentioned the trip in his first statement to them. but the defense said because that interview wasn't recorded, what can anyone really know about what was or wasn't said? >> without actually having his interview, now we're going based on one detective's notes saying that he didn't go home that day. >> reporter: david dooley says he knows what he told them. >> i did tell them i went home. i was always very adamant about that. >> reporter: dooley never testified in front of the jury, but he did talk to "dateline" his story that differed from his you say you went home to check on your wi. they talk to your wife, and she says he never came home. then later, in a separate interview she says he came home

came home to change his pants. so what's the truth and why can't you and your wife agree on the same story? >> we do agree that i came home. i have never heard an interview where she said that i did not come home. this was his testimony. >> reporter: the detective? >> as far as i'm concerned, yes. as far as i'm concerned it is not the truth if it cannot be factually proved. >> reporter: did you go home to change your pants? >> no, i did not. >> reporter: why would your wife say that you did? >> i do not know. we've talked about that a couple of times. and the only thing we can come up with is she didn't hear me properly. >> reporter: janet says she's been diagnosed deaf one ear. on the day of the murder, she says she only saw a pair of ripped pants in the house and thoughdavid said that's why he came home. >> i told them what i thought i heard him say. so a person that cannot hear, they put things together themself through their eyes, and i did. >> reporter: in court, the defense sought to set the record straight for the jury. >> dave didn't change his

his story. >> reporter: as for that co-worker who also had a story about dooley telling him he ripped his pants? >> why did he wait five to seven days later on to all of a sudden recall, ohyeah, and david said this? >> reporter: and the defense posed the million dollar question to the jury -( who would want michelle mockbee dead? >> is money a motive? for whom? not david dooley. >> reporter: the jurors heard that the mockbees had around $25,000 in credit card debt. dan said he had no idea. >> i never took care of the finances at all. she wanted to do it, and i was more than happy to let her. >> reporter: the defense then asked dan about the insurance pay-out he received after his wife's death. >> do you recall the amount of that payment? >> mm, 700 grand, something like that.

or believe whether or not dan mockbee killed his wife. but it's about reasonable doubt for our client, david dooley. >> reporter: but more significant to the defense was the unknown dna found at the crime scene. dna was found on michelle's body or on her belongings in at least five different places. >> we heard testimony that there were many unknown dna profiles. could one of these unknown profiles have been the killer? >> reporter: the defense also disputed that thermo fisher was a secure facility and noted that something had set off the warehouse alarm system just three days before the murder. and you think that's significant? >> yeah. yeah, it's significant. that means that someone could have gained access to thermo fisher. >> reporter: after both sides had presented their cases, it was time for closing arguments. now ea side would have its last opportunity to speak to the jury. the defense went first.

reason to kill michelle mockbee. so what motive would david dooley have to kill michelle mockbee? >> reporter: but it was only after the defense had wrapped up its closing that the prosecutor gave her answer to that question, laying out her theory of motive for first time. >> i would suggest to you that the evidence is right in that stack of stuff over there. you have time cards, you have invoices, all kept in michelle's office. >> reporter: you think the motive was the time cards? >> yeah. i believe that michelle had actually discovered the fact that he haactually been triple-dipping by clocking himself in, clocking his wife in and getting paid hourly to do a job that they were already being paid a monthly salary to do. >> reporter: that feels like a thin motive. >> sometimes, desperate people do desperate things. >> reporter: the defense attorneys never had a chance to challenge that theory in court, but they say there was zero evidence presented by the prosecution to prove it.

there was some evidence, they would have put it in there. >> reporter: what about the theory that you were double-dipping your pay? >> it is not true. >> reporter: you were not double-dipping your pay or triple-dipping or stealing? >> no, we were not. >> reporter: but the jury would have to render its decision based only on what was presented in court. after deliberating for some 16 hours over two days, word came there was a verdict. >> we the jury find the defendant, david dooley, guilty of murder under instruction number five. >> reporter:uilty of the murder of michelle mockbee. the jury foreperson told "dateline" that in the end david and janet's own statements, which jurors felt were inconsistent, helped them reach their verdict. david dooley was sentenced to life in prison. he says he regrets not taking the stand and has filed for appeal. did you have anything to do with the death of michelle mockbee? >> no, i did not.

>> reporter: you know getting convictions reversed on appeal is a long shot. >> but when you're innocent, it does happen. and it will happen just like it always has. >> reporter: yououhink you'll be a free man one day? >> yes, i do. >> reporter: michelle's family believes strongly that the jury got it right, though the aftermath is bittersweet. >> nothing's going to bring michelle back. there is no justice that is good enough. >> reporter: now their focus moving forward is on giving love and support to dan and the girls. what did your daughters say to you about this? >> neither one of them want to talk about it to this day. because they're just too sad. >> reporter: dan is hoping the two young women he's raising will carry the spirit of the one

>> we've talked about mom and things she liked to do. she just exuded personality and fun and happiness. that's what michelle was. >> that's all for this edition of "dateline." i'm lester holt. thanks for joining us. political gravity and every prediction of his imminent collapse. wall? >> and he now says he's in this race for long run. >> i'm not leaving. >> going straight to the white house? >> going all theway. >> and he's ready to use bill clinton's personal past as a weapon. >> i don't want to say it's a threat, but it's a threat. >> my sit-down with donald trump. plus, the republican circular firing squad. >> i don't care if your name is barack obama, ted cruz, marco rubio, you've never run a thing of consequence in your life. >> while the candidates fight,

who should they be worrying about more? trump or ted cruz? and with three weeks to go before the voting begins, polls in new hampshire and iowa are out, and don't look now but we have a real race on the democratic side. > ining me for insight and analysis are jeff greenfield of politico and the daily beast. helene cooper of the "new york times." jennifer jacobs of the "des moines register" and robert costa of the "washington post." welcome to sunday. it's "meet the press." good sunday morning. apologies for all of you that didn't win powerball, but we've got a huge show for you today, includeing my sit down with donald trump and the struggling everyday by some in the so-called republican establishment to figure oet some way to stop either trump or ted cruz from becoming the party's nominee. we can say this -- they've got their work cut out for them. according to our brand new nbc news/"wall street

iowa, ted cruz holds a slim lead