Yung Ning Soo was 21 when he was last seen in San Francisco on January 12, 1984. He was classified as a dependent adult at the time and was reported to possibly display violent tendencies. Soo, originally from China, carried a Chinese passport when he disappeared and was last seen wearing a gray suit.

He is described as an Asian male, 5 feet 6 inches, about 150 pounds, with black hair and brown eyes. Dental records exist, but no DNA or fingerprint data has been obtained. The San Francisco Police Department continues to seek information.

Can anyone who knew Yung Soo, his routines, or movements in January 1984 help investigators?