ELMWOOD PARK, Ill. (CBS) — Police were investigating Monday after a 19-year-old man was shot and killed in Elmwood Park over the weekend.

The shooting happened around 5:50 a.m. Sunday in the 2800 block of 77th Avenue in Elmwood Park, local police said.

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The victim was shot outside a friend’s house and died four hours later at an area hospital, police said.

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He was identified as Andres Damian-Salgato.

Police said it is believed that the victim and the gunman knew each other, and the incident was isolated.

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The shooting remained under investigation Monday.