here is josh mankiewicz. >> put people in a work space together and things can develop. friendships, rivalries, and love. usually it is not a problem. in this case, it was deadly. >> he is laying there with a bullet hole in his head. >> one man's militant style of doing business, which left a trail of boos the lows in his professional life. if you're not doing with your job require, season once you have it. >> and a chill of broken hearts in his personal life. >> at work i could tell that he was probably a pretty good womanizer. >> by the end of it, investigators would discover a world of grudges and a hotbed of affairs and messy love triangles. and it all began with this man, nicolas morelos. >> we were constantly teasing and messing with each other. >> john morelos and his brother nick grew up outside tucson, arizona. what was he like as a little brother? >> a prankster. he was either going to get in trouble or he had already done something that would've gotten him in trouble. >> or he was going to get you in trouble. >> absolutely. >> just 18 months apart, john and ni

here's josh mankiewicz, with the mystery on i'll be inroad. >> how would it feel to have brutal, life altering injuries, but to have the memories of how you got those injuries wiped out the instant you receive them. how they feel to have a golf in your mind, that stands between you and justice. november 11th, 2009, 1:30 am. a moonless night in the wheat fields of pullman washington. as bob katie drove home from a bar he owns, i'll be in the road was pitch black and dead quiet. >> as i came off the road, initially when i thought i saw on the road was somebody's mcdonald's bag in their drink, that they had thrown out the window. >> just trash on the? road >> just trash. i was going to pull off on the right i was gonna drive over it. >> as bob drove closer, he saw the object in the road wasn't garbage, at all. >> as i got maybe 20 yards away, i realized it was somebody, laying in the road. >> a young woman. she could've been more than 20 or 25 years old, bleeding, barefoot. unconscious. >> bob katie parked his truck sideways in the road to shield the woman from oncoming cars. he then ran

here's josh mankiewicz with "thi early shift." . >> they call it the early shift for a reason. i it was still an hour before dawn in this small town in northern kentucky.ur and in a few hours, a local warehouse would become an anthill of activity as the first employees of the morning arrived. who among them could predict before the first coffee break that dayst one of their coworke would be dead? >> i just walked in her office. and i think somebody killed somebody in her office. . >> what makes you think somebody killed somebody? >> she's laying there and there is blood all over. >> everyone knows everyone. there was michelle mockby, 42, wife and mother, face down in a pool of blood. the investigation that followed would peel the lid off an entire company and take a hard look at every employee who was there that morning. >> you know your suspect is one of those people in the building. >> that's right. >> probing t for clues in the victim's private life. >> the detective asked me if there was any trouble in their marriage. >> eliminating suspect after suspect until there was one

josh mankiewicz here again with "unraveled."members the report on dwight said he was not an imminent threat. >> but the psychiatrist that evaluated him called me and told me that he was dangerous. and that i should get a bodyguard. >> enter him. >> enter richard anglin. >> connie hired rick, the private investigator, to do surveillance on dwight and to assess how much of a threat he posed. rick and his team tailed dwight, took photos and vitd of him and combed threw his clutter debris filled room in the family home and found some books with seriously disturbing titles. >> how to get even with people. how to injure people in street fighting. it starts to put a makeup of somebody who is trying to plan something. >> he made sure she and her son always had eyes on them. >> i had people full time on the school where the son goes. if connie went to the grocery store, had a public event, went to work, somebody was with her. >> anglin moved connie and her son among three remote safe houses. >> well, this is like a chess game. >> anglin

here is josh mankiewicz, with "the night brianna vanished". >> sunday, january 20th, 2008 in a neighborhoodup the hill from reno's silver plated heart, college students jessica and katie, we're waking up after a long night of parting, with their friend, brianna denison. he had slept on the living room couch back home, but when jessica woke up. >> we went up to the kitchen, started making breakfast. the kitchen was right in front of the couch, and breonna was not sleeping there anymore. >> at first, they were not concerned. >> so we figured maybe she was upstairs, with one of the room it's empty rooms. >> k.t. hunter went upstairs to the bedroom to see if she was sleeping there. >> i knocked on the door and was like hey, time to get up. >> at 9:45, k.t. tried once again to wake breonna. once again, she got no response. >> and i was pounding on the door, and not getting answers. we are starting to pound on my other roommates door. and it was like, all of these things running through my mind. where is she? >> only then did it hit k.t. that breonna was not in the house. what scared k.t., was wh