UPDATED at 11:15 a.m. Thursday with man's death, and that police believe it was a suicide.

A man found gravely wounded on a downtown sidewalk late Wednesday has died and his death is being investigated as a suicide, police said Thursday.

The 28-year-old man had suffered a gunshot wound to the head. He was unconscious and barely breathing when officers arrived just before 10 p.m. to the 900 block of Olive Street.

Witnesses saw the man standing on the sidewalk, heard one shot and saw him fall to the ground, police said. A gun was found next to him.

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