>> reporter: four and a half years after tom kolman was found dead in his car -- gil nunez, went on trial for killing the man he once called his best friend. was there any doubt in your mind nunez went to see tom that morning with the intent to kill him? >> no doubt in my mind. ? there's no other viable explanation. i'm open for explanation or reasons or somebody else, but it's not there. >> did you feel you had a rock solid case? >> it was a circumstance substantial case going into it. there was no smoking gun, no eyewitness, there was no confession. but when you put everything together we knew we had a solid case. >> i was glad to see him being exposed for what he truly was.