William Anthony Marshall was 18 when he left his home in Humble, Texas, on May 30, 1980, and never returned. Known as Bill or Billy, he was between 6 feet 0 inches and 6 feet 2 inches tall and weighed about 180 to 200 pounds, with brown hair and blue eyes.

His disappearance is classified as endangered missing. Very little is known about what happened after he left home, and the Houston Police Department lists no significant leads in the file. The case remains open and under investigation.

If anyone knew William, saw him around Humble in late May 1980, or has information that could help investigators, please contact the Houston Police Department.