on seth penalver, detectives went to an ex-girlfriend, melissa monroe. >> they tell her they're thereabout seth. eventually they take her back to the police station, they show her the two same pictures, and they're saying to her, who is this? >> the left photograph is pablo ibar and the right photograph is seth. >> melissa monroe had also seen seth and pablo together at casey's bar on the night of the murders. >> i saw them at casey's on the sunday, on -- well, saturday night, sunday morning. i talked to them when i was on the dance floor. seth kept asking me to dance. >> we had all of these witnesses that corroborated and connected seth penalver and pablo ibar to mr. butch casey, the tec-9 gun, and his car. >> seth penalver, a high school dropout with a previous robbery to his name, soon learned he was wanted for murder. >> i actually seen all this stuff in the newspaper, they want to question me about a triple murder. they had a description of my car in there, and if you know his whereabouts, please contact us. >> seth decided to turn himself in. >> because i didn't commit this crim