Mark Andreasen was 26 when he was last seen on October 1, 1982, in South Lake Tahoe, California. His last known location was on Apache Avenue. He was described as a white male with brown hair and blue eyes.

Few details about the circumstances of his disappearance are available and the investigation has produced no substantial breakthroughs. The case remains classified as a missing person investigation and has gone cold, with authorities continuing to seek public assistance for new leads.

If anyone remembers Mark, his movements in South Lake Tahoe around October 1, 1982, or has information that could help, please come forward.