CARSON ( — A Navy veteran is in a coma after a robbery in Carson turned violent, authorities said.

Frank Hernandez, 86, was on his daily walk Wednesday afternoon when he was stopped by a man near 223rd and Dolores streets. The assailant demanded money from Hernandez, punching the Korean War veteran before taking his wallet, authorities said.

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Neighbors told CBS2 News they became worried when Hernandez failed to return home after his trip to the store to buy lottery tickets.

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Hernandez remained in a coma Friday at Providence Little Company of Mary Hospital in Torrance with a swelling and bleeding of the brain.

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The Los Angeles Sheriff’s Department says deputies have a vague description of the suspect and are working on a composite sketch of the man.