Mark Allen Thompson, 30, was last seen November 1, 2001, after leaving the Pro Shop Pub in downtown Clearwater. He lived with his mother and was reported missing when he did not show for work the next day. On November 5 his 1998 Ford Ranger pickup was found abandoned in Tampa; there was no sign of Mark inside and no obvious sign of foul play in the vehicle.

Thompson had a diagnosis of bipolar disorder and required medication, which he may not have had when he disappeared. Investigators have examined several lines of inquiry, including possible links to other missing men from the area who were gay and in a similar age range. Some speculation has suggested a pattern involving potential serial offenders, but no concrete evidence has tied his case to others.

His disappearance remains unsolved and authorities continue to seek new information. If anyone knew Mark, his routines, or saw that truck in early November 2001, please share what you know.