Officers say the suspect is under 18, so they're not releasing their name.
Early Sunday morning, detectives believe the suspect was inside a BMW near Thiele and Spruce when the vehicle crashed into a parked car.
Investigators say the driver of the BMW left the scene, possibly with more passengers.
Police found 19-year-old Alex Martinez unconscious in the back seat, and he died from his injuries.
Authorities have not released any details about the cause of the crash.