SLIPPERY ROCK TWP., Pa. (WKBN) – Pennsylvania State Police are investigating a homicide after a bystander found a man dead on the side of the road.

According to a report, a passerby found 40-year-old Joseph Detello, of Meadville, unresponsive next to his car on Young Road. The passerby thought Detello might have been having problems with his tire.

The bystander called 911 and gave CPR but when crews arrived on scene, they pronounced the man dead. Two other people had stopped to help before crews arrived.

An autopsy determined Detello’s cause of death to be asphyxiation.

PSP asks that anyone with information on the incident call 724-598-2211.

Sara Pompeo contributed to this report.