MODESTO, Calif. (CBS13) – A Modesto man is accused of assaulting and critically injuring a 70-year-old male security guard who police say tried to intervene in a fight in a parking garage.  The security guard, who was identified as Karl Whitehead, later died as a result of his injuries.

Don Lacey, 33, was arrested and booked into the Stanislaus County Jail on charges that include assault with great bodily injury.

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Police say the assault happened late Friday night in the parking garage at 915 11th Street.  When officers arrived on scene, they found the security guard unconscious with head injuries.  He was taken to a hospital and initially was listed in critical condition until he succumbed to his injuries Sunday afternoon.

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After an investigation, police said the security guard intervened in an argument between Lacey and a female parking attendant.  Lacey then struck the security guard, police said.

Police say a witness followed Lacey from the parking garage until police arrived and took him into custody.

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If you have any information about this incident, you’re asked to call the Modesto Police Department.