with his camera, aidan mcgoll videotapes what happens next.ose-range shooting after gary takes aim. >> once i was past the pay phone, six feet or so, he turned and fired. [ gunshot ] >> i hear this pop, and it's almost like a firecracker. >> i turned around, i recognized gary at that point because he was facing me. >> barnett's disbelief can be heard in the footage. >> gary! why, gary? why? >> the film shows i said "why?" he's got a house full of children, and now he's going to spend the rest of his life in a penitentiary. i mean, who's going to take care of your kids? why did you do this? i've known gary since high school. laid-back. last person in the world you'd think would be aggressive. >> photographer aidan mcgoll, now an assistant district attorney, the cameraman -- >> i follow jeff who is all of a sudden falling, his body is completely limp. and he turns his head. i could see coming out of his right ear blood. and as i pan up with my camera, i can see gary plauche standing there. and almost immediately the two officers who was escortin