Mario Gallegos, 44, was shot and killed inside his Long Beach home on the 6200 block of California Avenue near Houghton Park on May 10, 2023. Emergency responders found him with life-threatening upper-body wounds; he was taken to a hospital and pronounced dead at 6:56 a.m.

Police say 41-year-old Long Beach resident Oscar Alejandro Chan allegedly arrived unannounced at the residence shared by Gallegos and Gallegos’s girlfriend, who is Chan’s former partner. An altercation between Chan and Gallegos reportedly ended when Chan shot Gallegos, then fled. Chan was located and arrested in Santa Fe Springs later that day and was booked on suspicion of murder, being a convicted felon in possession of a firearm, and illegal possession of ammunition; he was held on $2 million bail.

Investigators believe the shooting grew out of a dispute involving Chan, his ex-girlfriend, and Gallegos, though the exact motive remains under investigation. Anyone with information that could help detectives is asked to come forward.