According to the Los Angeles County Sheriff's Department, one person was shot at a home in the 1100 block of West Avenue J 8. Authorities initially described the incident as a double shooting.
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Authorities said it happened around 12:21 p.m.
In an update issued by the sheriff's department, investigators confirmed a 54-year-old man died at the scene.
A second person involved, a 76-year-old man, was transported to a hospital after sustaining blunt force trauma to his upper body when he was hit by a "blunt instrument," authorities said. He is in stable condition.
Authorities said there is no suspect at large.
LASD determined through a preliminary investigation that the men "were involved in an altercation" that escalated and resulted in the injuries.
AIR7 HD cameras captured deputies surrounding the home.
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Anyone with information is urged to contact the L.A. County Sheriff's Department's Homicide Bureau at 323-890-5500.
You can also submit an anonymous tip with Crime Stoppers by calling 800-222-TIPS (8477).
City News Service contributed to this report.