The First 48 (2004) : 6x14

In Miami, Detective Rolly Garcia investigates the murder of a 17-year-old boy beaten to death and dumped in the back seat of his car. To find his suspect, Garcia must first track down the victim's secret girlfriend, who may have been the last person to see the victim alive. And in Dallas, a young man is found shot dead in the parking lot of a housing complex. Detective Bob Ermatinger and his team must convince reluctant witnesses to come forward.