Ryan Estrella, 24, was found lying in the parking lot at the complex with a gunshot wound.
Medical personnel pronounced Estrella dead at the scene.
Sheriff's homicide detectives were investigating the incident. Anyone with information related to the incident is asked to contact the sheriff's department at (909) 387-3589 or 387-8313. Anonymous tips can be left at (800) 78-CRIME, or through http://wetip.com/.
A $1,000 reward was offered for information leading to the arrest and conviction of the perpetrator(s).