CARSON (CBSLA.com) — 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.

READ MORE: Malibu's Leo Carrillo State Park Partially Reopens This Weekend; Pacific Coast Highway Down To 1 Lane In Ventura County To Repair Surf Erosion

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

READ MORE: Sheriff: Gunman Shot At Man From Moving Car, Then Chased Him To Lancaster Gas Station To Shoot Him Again In The Head

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

MORE NEWS: Meat Loaf, Entertainer Known For 'I'd Do Anything For Love,' Countless Other Hits, Dies At 74

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.