The discovery was made about midnight at the Katella Mobile Home Estates at 10800 Dale Ave., according to the Orange County Sheriff's Department.
Deputies responded to a report of shots fired and located the unidentified victim, who was pronounced dead at the scene. He had been shot multiple times, authorities said.
Investigators were seen examining a four-door sedan at the location. Sheriff's Lt. Jarrett Kurimay said they hoped possible witnesses and surveillance footage would lead to the shooter.