Mark Johnson was 26 when he was last seen in San Diego, California, on March 1, 1997. He left home around 2:00 a.m. and never returned or made contact; his girlfriend reported him missing after he failed to reconnect. He is described as a white male, 5 feet 10 inches, about 155 pounds, with brown hair.

Mark was known to travel frequently to Tijuana, Mexico, and there was early speculation he might have crossed the border before his disappearance, but no confirmed sightings or solid leads have emerged. His case remains unsolved and listed in databases such as NamUs; his family continues to seek answers.

If anyone knew Mark, saw him around March 1, 1997, or has information about his trips to Tijuana, please share what you know.