SAN FRANCISCO (CBS SF) — A 38-year-old man has been arrested in connection with the beating death of a man in San Francisco’s Tenderloin neighborhood, police said.

Sylvester Guard of San Francisco was arrested Sunday in the Tenderloin on suspicion of voluntary manslaughter.

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Guard is accused of assaulting the victim, a 66-year-old man, with his fists in the 700 block of O’Farrell Street at about 1:20 p.m. Sunday, according to police.

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The victim was taken to a hospital, where he died. His name was not immediately released by the medical examiner’s office.

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The case remained under investigation and no further details are available.