Tulsa Police are investigating a homicide after they say a man was found shot in the head in a pickup truck.

Police say Ricardo Estrada was taken to the hospital Saturday night with what was thought to be a head injury near Admiral and Lewis sometime before 11. It wasn't until he was at the hospital that it was discovered he had been shot in the back of the head.

Police say he died on Sunday.

They say detectives are investigating what led to the shooting.

If you have any information on the shooting, you're asked to call CrimeStoppers at 918-596-COPS.