Police received multiple reports of shots fired shortly before 10 p.m. Thursday in the 1300 block of South Orange Avenue.
Responding officers found two male victims outside the complex, suffering from gunshot wounds. A 22-year-old was shot in the hand, and a 40-year-old was shot multiple times in the upper body, police said.
Both men were transported to an area hospital, where the 40-year-old man died.
Investigators said the shooting stemmed from a domestic dispute. Two suspects were arrested in the area shortly after the shooting.
Zachary Simmons, 20, of Moreno Valley, and Andre Evans, 39, of Hesperia, were booked into the Fullerton City Jail on suspicion of murder.
The investigation is ongoing. If you have any relevant information about this case, you're urged to contact Detective V. Gardea with the Fullerton Police Department at (714) 738-6728. You can provide anonymous tips by calling Orange County Crime Stoppers at (855) TIP-OCCS.