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>> prosecutors believe moore steam cleaned the camper and got rid of the cot to hide the forensic evidence. but the brain tissue convinced medical experts that brad was dead. all prosecutors had to do was convince a jury of that. >> as a prosecutor, clearly you want to make damn sure that this is the right guy and there has been a murder. i can't think of anything worse than being in a position of finding out you convicted the wrong person. >> larry moore denied killing brad brisbin and pleaded not guilty. prosecutors argued that larry moore killed brad brisbin in a jealous rage, convinced bra...

He's still that goofy kid and there are moments when he's free enough of anxiety he can express that. but it's only moments. it's not days. it's not hours. it's not enough. >> this his doctors believe, is both his best and last hope. deep brain stimulation, or dbs. >> how are you feeling right now? >> happy? >> electrodes are placed in brett's brain tissue to short circuit the signals that cause so much anxiety and fear. >> when we're stimulating, he started laughing and he started you know, he became really happy, his mood was elevated. he was talking a lot better. >> feel like laughing, that...

Because even casual contact could result in a dangerous or life-threatening event. >> florence's parents are raising her children and keep a small garden in her memory, although the grief is permanent. >> i miss her every single minute of every single day. and i hope he thinks about what he's done for the rest of his miserable life. >> mark unger almost got away with murder. only scientific analysis of brain tissue and his shoes ensured he didn't. >> how he could think he was going to get away with it, i can't imagine. >> being able to establish that florence was alive for an extended period o...

That florence's death was an accident, but the medical examiner completely disagreed. >> bodies do not bounce. that's number one. she would have been rendered unconscious upon contact. an unconscious person, unconscious individual cannot just walk into the water. >> and dr. dragovic noticed the blood stain on the boat launch was nearly a foot in diameter. >> for blood to go to that size to the diameter that we're talking on the cement platform, the body would have had to have been there for a period of time. >> to find out how long florence would have laid there bleeding, dr. dragovic examined...

>> next, scientists tested the tiny fragment of brain tissue. it was too small for rflp testing since it was about the size of a pinhead. so scientists amplified it, using pcr, a process that duplicates a small sample to make it large enough to test. the pcr dna tests revealed that the brain tissue in larry moore's camper was brad brisbin's. >> i knew it was going to be a match. this confirmation that the blood matched was huge. i never felt anything like that before. >> with this discovery, the medical examiner ruled brad brisbin's death a homicide. larry moore was arrested and charged with m...