TUCSON, Ariz. (AP) — Authorities have identified a man who was fatally shot in the parking lot of an apartment complex on Tucson's eastside.

Tucson police say officers were called to the apartments about 10 p.m. Tuesday after a report of shots fired.

Police found 20-year-old Brandon Paul Casteel in a car that was stopped in the middle of the parking lot with obvious gunshot trauma.

Tucson Fire Department paramedics transported Casteel to a hospital, where he later died.

A possible motive for the shooting isn't immediately clear.

Police say they're still looking for suspects and their investigation is ongoing.