Mark Devine Coley was 33 when he was last seen in Rochester, New York, on October 11, 2012. Family and police describe him as a Black male about 5 feet 3 inches to 5 feet 5 inches tall, weighing 140 to 145 pounds, with black hair, brown eyes and a light mustache. He was known by the nickname Theory and was believed to be wearing black jeans and a white T‑shirt when he disappeared.

The Rochester Police Department opened an investigation under case number 12-337138; the official report was filed October 27, 2012, and the case was entered into NamUS as MP21004. DNA from family members has been collected to assist identification, but there have been no confirmed sightings or significant leads reported and the case has gone cold.

If anyone in Rochester in October 2012 remembers seeing Mark or has information that could help locate him, please come forward.