i did not pull the trigger on the gun that shot sneiderman, rusty sneiderman. >> the cops sweated him. >> don't raise your eyebrows. you were there when he got shot. >> you're this close to telling me. >> telling you what? >> telling me why this all happened. >> reporter: but then he shut down. even so, detectives thought they had enough evidence linking him to the crime. they arrested him and charged him with murder. then, an amazing turn of events. after his steadfast denials, the engineer admitted that, yes, he was the shooter. but he said he was not guilty of the crime because he had been insane when he pulled the trigger. a little more than a year after his arrest, hemy neuman's trial for murder began and the prosecutor said his insanity plea was prepros rouse. >> hemy neuman killed rusty sneiderman because he wanted his wife, his money, because he wanted his life. period. >> reporter: and according to the prosecutor, the evidence would show that hemy knew exactly what he needed to do to accomplish that goal. far from being crazy, the prosecutor said, he tried to plan the perfect