Authorities arrested a man after finding his roommate fatally shot inside a Long Beach apartment early Sunday.
According to Long Beach police, a call about shots fired in the 1500 block of E. Artesia Boulevard came in just after 12:37 a.m.
The agency said police arrived at an apartment unit, where they discovered a 33-year-old with a gunshot wound to the upper torso.
They performed life-saving measures before Long Beach fire responded and pronounced the victim dead at the scene, Lt. James Richardson told KTLA.
Soon after, patrol officers found 23-year-old Zaire El, who also lived in the apartment.
Police said they arrested him on suspicion of murder, as well as for an outstanding traffic warrant. Detectives reported recovering a firearm at the scene.
Investigators described the suspect and the victim as "cohabitants."
Officials are withholding the victim's identity pending notification of kin. A motive remained unclear.
Anyone with information can call detectives Mark Mattia and Donald Collier at 562-570-7244. Those who wish to remain anonymous can contact Crime Stoppers by calling 800-222-TIPS (8477), using the mobile app "P3 Tips" or visiting lacrimestoppers.org.
KTLA's Anna Albaryan contributed to this report.