Richard McNaulty, 57, was found at 12:15 a.m. today at the West Portal San Francisco Municipal Railway station, police said.
McNaulty had last been seen in the vicinity of San Francisco City College at about 11 a.m. Tuesday, police said.
Police said his disappearance raised concern because McNaulty has the mental capacity of a 10-year-old and is unable to read and write. He is also diabetic and did not have his medication with him.
