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Can you give us some color that we didn't see in that courtroom? >> as you said earlier it was really emotional, quite traumat traumatic. remember this is the 12th anniversary of oscar pistorius' mother's death. so to hear the gruesome quite graphic details, the doctor was describing what he saw. and as he walked into the house, reeva steenkamp he said was lying on her back, oscar had one hand over a wound in her thigh. his other hand two fingers in her mouth trying to clear her airways, but she had clinched down on him. he was obviously sobbing, crying. during all of this quite graphic detail...

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 brad was sleeping with his wife,...

And the sample had both small granular cells and larger purkinje cells. this meant only one thing. this was muscle. but they wanted a second opinion. >> so they sent this tissue to a fellow named mike collin who is a neuropathologist in ohio. he looked at it and said, yeah, it's mammal and it's cerebellum. it's the brain stem. >> the cerebellum sits at the base of the brain and is primarily responsible for memory and motor movement. since the cerebellum controls the heart muscle, no human can survive without it. a ballistics expert compared the location of the brain tissue in the camper with t...

>> 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...

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...