and eventually convicted of first-degree murder, and was sentenced to life in prison. >> david kopenheffer is the master manipulator. it's an intellectual game, an intellectual challenge to see how far he can push the system and what he can get away with. >> i think if he were out he'd kill again. he'd put a contract on me and harry weiner while the trial was going on because we were key witnesses against him. i don't think that he would stop at anything. >> despite the overwhelming amount of forensic evidence against him, kopenheffer continues to maintain his innocence. >> that's the arrogance of the man, that despite overwhelming evidence as to his guilt and many defendants do this, they still, still refuse to accept responsibility for the crimes that they've committed. and that's the sin, one of the sins of all of this. >> this case, in my own opinion,