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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.

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