circumstantial evidence that you just don't get every day, that you just don't see every day, that people can look at it, and see it, touch it, and relate to it. up next, an explosion rips through an illinois church. evidence was everywhere. >> we found evidence oven top of buildings. the debris field was huge. >> two teenagers implicate one another. dungeons and "dungeons and dragons" looks like the cause. >> i thought that was an incredibly stupid thing to do. >> but a thin blue wire told a different story. oakwood, illinois, is a quiet,

small town of less than a thousand residents, and little, if any, violent crime. at the oakwood methodist church, as volunteers prepared for their christmas celebration, church member brian plower walked outside where something caught his attention. >> some of us thought that maybe a vehicle had driven into the church. >> we got there right after the first responders did, and their first reaction was that it was a gas explosion. >> 46-year-old brian plower was killed instantly. he left behind a wife and three children. >> very charismatic, gregarious. brian never met anybody he didn't like. >> bill adams' daughter walked out just moments before the explosion. >> it is by pure chance that it could have been my daughter, you know. i've often thought that brian took what could have happened to

my daughter. >> agents from the bureau of alcohol, tobacco, firearms and explosives were called in to investigate. >> we found metal fragmentation, we found pieces of pipe nipple. we picked up any pieces of wire we found. batteries, we did find some 9-volt batteries. we picked up everything. >> this clearly eliminated a gas line explosion. these were the ingredients of a pipe bomb, a homemade device in which gunpowder is packed into a steel pipe, closed with metal end caps. in this case, fragments of red painted end caps were found in the rubble along with 30-gauge blue insulated silver coated copper wire. >> this was not very common wire to be a signature of a bomber. >> a signature is something

unusual or unique left by the bomber, often without knowing it. >> we actually found a piece of green plastic that had a label on it that said igloo legend 12, which is a cooler. >> this meant the pipe bomb was inside the cooler, activated with a trip wire. investigators did not believe that the victim was the intended target. >> it was very apparent to us that this was very random. there was nothing in mr. plower's background to indicate him being the target of a crime. >> after some digging, investigators learned two important pieces of information. first, the only store within 25 miles that sold 30-gauge blue insulated silver coated copper wire was the local radioshack electronics store. >> since only one merchandiser sold that wire, if they kept records of their transactions,

that that could prove helpful in getting a lead. >> and there was only one store that sold the igloo brand legend 12 cooler. >> we found out that that color scheme was only sold at walmart. so that narrowed our focus then on where that cooler could have been purchased. >> then investigators got an anonymous tip that two students at oakwood high school might have been involved. >> one of them had a past criminal history with one of the offenses being arson. >> one of the subjects had been seen in possession of a notebook that had handwritten on the front of it bomb recipes. >> the teenagers, 18-year-old jimmy morris and 16-year-old phil ryan, had no alibis for the time of the bombing. >> at first they said that they were driving past the scene when the explosion happened. then they said that they were

there within moments and saw brian plower in the moments just before the explosion. >> from a photo line-up, employees at the local radioshack store identified jimmy morris as having been in their store but couldn't recall what he purchased. >> everything that the investigation showed about the teenagers indicated that they could be involved in this. >> investigators also learned that the boys were heavily involved in the game "dungeons and dragons," a fantasy-oriented game played by more than 20 million people worldwide. it allows participants to assume imaginary, often violent, identities. >> there had been across the country instances where the role-playing within the game of

"dungeons and dragons" had turned violent in real life. >> both teenagers denied involvement in the bombing and were given polygraphs. >> the polygraph indicated that they were giving some deceptive answers when questioned about bombs and bomb making. >> eventually they each implicated the other. >> both subjects stated that they saw the other subject in possession of a green cooler. >> it looked like investigators had solved the case. until there was another bombing just five miles away. ♪ of their type 2 diabetes... ...with non-insulin victoza. for a while, i took a pill to lower my blood sugar, but it didn't get me to my goal. so i asked my doctor about victoza. he said victoza works differently than pills, and comes in a pen.

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the first assembly of god church in danville, illinois, was located five miles away from the location of the first bombing. >> a blast injured 33 people, most of them teenagers. >> those injured from the church bombing may never recover emotionally.

>> this second bombing was more powerful than the first. >> when we first arrived on the scene, we were in shock. there was a hole in the west wall that was big enough to drive a truck through. it was unbelievable. >> the explosion happened next to the pews where a church youth group was sitting. 33 people were injured. >> they had shrapnel that had been embedded in their face, some in their ears. this was just an explosion of such powerful magnitude that debris rained down on them. >> it's just something you don't see every day. it involved two churches. you don't see a lot of crime against churches. >> the atf looked everywhere for pieces of the explosive device. >> we found evidence on top of buildings, everywhere. the debris field was huge. >> eventually, atf investigators found more than 20 different

bomb components, which enabled them to build a replica. this one was triggered by a timer. this bomb was clearly larger and more powerful than the first. >> there were a lot of differences there, which leaves you with two alternatives. either they're experimenting, graduating up to bigger and better things. the other alternative is that it was two separate people that made these devices. >> to find out, forensic examiners looked at the wire from the second bomb site. was this the same signature wire used in the first bomb? >> it was a silver-coated, single strand copper wire with blue insulation. >> it was 30-gauge, very small wire. >> but was it the same wire? atf examiner greg klees examined the extrusion marks made on the

plastic insulation as it squeezed through the dye during the manufacturing process. this process makes the wire its uniform size. >> those marks will be part of -- on that plastic insulation for a number of feet before it changes dramatically. >> lined up on a comparison microscope, there was no doubt. the wire from both bomb sites came from the same source. >> in fact, that these were produced on the same forming dye at the same plant. >> they also discovered both bombs used the same glue and the same cotton string. since both bombs appeared to be made by the same individual, this eliminated jimmy morris and phil ryan. they both had solid alibis for the second bombing. but why did these boys implicate themselves in the first place?

>> they offered the explanation that they were doing this because they were playing this "dungeons and dragons" game. >> they really spent a lot of time wasting the time of investigators. >> i thought that was an incredibly stupid thing to do. >> then a witness came forward saying she had seen a white male walking a german shepherd dog near the church parking lot a few hours before the first bombing. she remembered the dog had a brown leather collar with a brass name tag on it, but she couldn't provide a description of the man. was this the break investigators needed? it's time to start living and driving like a winner. enter the quicken loans drive home a winner sweepstakes for your chance to win 12 mortgage-free months, courtesy of quicken loans and a 2015 chevy colorado.

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after two high school students were eliminated as suspects, the atf continued to search for leads. they suspected that the blue copper wire was purchased at the local radioshack store. unfortunately, most customers who bought this wire paid cash, so this was a dead end. the pipe had been inside a plastic cooler sold only in walmart stores. of the hundreds sold, only three were purchased with a credit

card or check. those individuals were interviewed and cleared. >> we were unable to associate that cooler with anyone that could be considered a person of interest. >> all of the other bomb components were common and could have been purchased anywhere. but investigators needed to find the bomber before he could strike again since his devices were getting more sophisticated. >> we did feel this was an escalation. it was a bigger device. it happened when more people were present. >> then a tipster came forward, a member of the church where the second bombing took place. >> a member of the church said, i don't know if this means much, but there was a gentleman by the name of mr. white, and i know he attended this church approximately five or six years prior. and had sought get into the church as a member and had been

turned down. >> 40-year-old richard white lived just 12 miles away from the church with his mother and his teenage daughter. >> we were told by a lot of neighbors that richard dean white was somebody that you did not want to mess with. >> a background revealed a troubled past. white was a high school dropout and spent time in the u.s. army but was discharged after only six weeks. later he spent time in four different psychiatric hospitals where he was diagnosed as a paranoid schizophrenic. >> one time he felt that there was demons underneath the floor in the bathroom, and he cut the bathroom floor out to get the demons out of there. >> eventually white got married and landed a job with general motors. his marriage ended after just six months, and he was laid off from his job in 1987. >> he wasn't able to retain friends or any relationships and

really was forced to move back home with his mother. >> white's psychiatric problems may have been the reason why the danville church rejected his application for membership. >> there has to be an agreement between the board, and because of some of the things that happened that was attributed to him, we didn't think that would be quite what we wanted at that particular time. >> investigators also learned that rick's ex-wife was a member of the oakwood united methodist church where the first bombing took place. >> i felt like that was what he was trying to strike out against her, and get even with her at the time that happened. >> then, four days after the second church bombing, before investigators could interview rick white, there was another bombing. this time in a residential neighborhood several miles away. >> bomb number 3. what are we going to do now?

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after two bombings and five months of investigation, the atf finally had a potential suspect in rick white. a background check revealed white had a history of psychiatric problems. >> i don't know that he had problems making friends, i just don't think rick wanted friends.

his dog was his friend. so that satisfied rick. >> so investigators decided to pay white a visit. they asked rick white's mother if they could speak to him. investigators found the garage behind the white's home in ruins. >> there was one victim inside the building along with a large dog. >> the victim had been decapitated. a driver's license found on the workbench identified him as richard white. >> we did not know if we had a victim or a suspect. >> but that question was answered as investigators sifted through the rubble. >> there were parts of bombs in there in the process of being made and tools, wiring, all

kinds of things that you could use to make pipe bombs. the circumstantial evidence would indicate that he intended to kill himself to avoid having to talk to the police. >> next to white's body was his german shepherd dog. it matched the description of the dog given by the witness near the first bomb site. >> he was obviously clutching the bomb close to his body, and he had his one friend in the world there with him, his other arm around his dog. >> also in the garage, investigators found blue silver-coated wire, the kind used in the two church bombings. they also found a pair of wire cutters. scientists compared the tool

marks from white's wire cutters to the tool marks on the copper wire found at the danville bomb site. >> from that comparison, i was able to conclude that these wire cutters, they recovered in rick white's garage was the same cutter found in the danville device. >> this was forensic proof that white was the bomber. >> we found an area of the garage that had red spray paint on it and contained on that red spray paint were perfectly round circles. the reason that was important was the device that killed mr. plower, which was a pipe bomb with end caps on it, those end caps were painted red with a gold coating. >> but questions remained. why did rick white target churches? investigators believe white was

angry at the first assembly of god church for turning down his membership application. but he couldn't bomb that church, at least not right away. it would have been too obvious. so he chose the oakwood united methodist church as his first target, possibly because his ex-wife was a member. >> he was experimenting. he was trying to get different things to work, different initiators for the device, different triggering systems. >> forensic evidence shows white placed the pipe bomb in a green cooler, not caring who would pick it up. church member brian plower was simply in the wrong place at the wrong time. in the first assembly of god church bombing, white used a stronger bomb since this was his

primary target. he placed the bomb on top of an outdoor air conditioner. service. 33 people were injured. in october of 1998, a grand jury concluded richard white built both bombs and murdered brian plower. the forensic evidence left no doubt. >> these investigations did not result in the prosecution. it was closure for the victim's family. >> it doesn't make the hurt less. you know, there is still pain. there is still, you know, anger. there is still hurt and loss and grief that continues and

continues and continues. >> with the bombing, the misconception is the blast destroys the evidence. the blast disperses the evidence where it makes it harder for us to find it. but we'll find it. up next, an unexplained death had medical experts baffled. >> at the end of the autopsy, i didn't find anything slightly wrong whatsoever. >> each new clue raises more questions. >> the trail is getting warmer and warmer. >> until a microscopic clue reveals the ultimate betrayal. >> no one would ever expect anyone would do this sort of thing to another human being. fall means football at the university of florida. it's also time for thousands of