. >> reporter: to prove it, the witness 'ear-witness'you could say, nick glover, the neighbor whose storytelevision and helped reopen the case. >> i heard him saying, oh my god what have i done, oh my god what have i done. >> reporter: nick was 15 at the time. he said he remembered crouching down inside his house, under an open window, listening to tom speak to people in his driveway. >> you can hear one of them, i do not know who it was, um say what, what do you mean? and he proceeded to say, i shot my wife. >> reporter: nick said he knew it was tom. he could see him out the window.. >> how certain are you that the voice you're hearing is tom fallis' voice? >> i am 100 percent. >> reporter: there was more. nick's mom, kathy glover, testified that on the night of the shooting, she got a strange phone call from a teenage neighbor. around 1am. >> she said please tell me you called the police and i said no, i didn't, why? and she said, because your neighbor just shot his wife. and i said, what!? and she said, i could hear her screaming get off me get off me. >> reporter: powerful evidence. a

well, just months after the shooting, young nick glover went camping, of all things, with tom, the veryconfess to shooting ashley fallis. >> at no time during the camping trip with tom fallis did you ever tell anybody that you were uncomfortable being there with tom fallis? >> i do not recall. >> reporter: who to believe? for example, there wasn't one but two, prosecution crime scene analysts. this one, you've already heard, believed it was murder. but this one? >> most people that shoot somebody in an act of rage, they don't stop with one shot. >> reporter: dan gilliam was the crime scene expert from the first investigation of ashley's death. using a defense attorney about th demonstrated how difficult it would have been for someone as tall as tom to have shot ashley at an angle that matched the bullet's trajectory. >> first of all, is that an unnatural position? for another person to be holding the gun in that manner? >> it is. it is for me. >> okay, and mr. fallis is six feet tall. how tall are you? >> i'm six feet as well. >> okay. >> reporter: and the gun was ashley's. the shooting