Mark John Derosia, 32, was last seen in Watertown, New York, on February 18, 2018. A friend had arranged a taxi to take him to a local hospital, but after being picked up he changed his destination and asked to be dropped off near the intersection of West Main Street and Court Street. That intersection is the last documented point in his movements; he reportedly had no further contact with anyone known to investigators.

The reason he needed transport to the hospital and why he altered his plans have not been publicly explained. Investigators confirmed the taxi records showing the drop-off and checked a tip that he might have traveled to Florida, but those inquiries produced no confirmed sightings. At the time he disappeared he was about 5 feet 10 inches, 180 pounds, with blue eyes and thick brown hair; he had numerous tattoos including a Jesus tattoo on his left shoulder and reportedly his name Mark John on his legs.

No confirmed subsequent sighting, suspect, or evidence explaining what happened after he left the taxi has been established. Did anyone in Watertown see Mark near West Main and Court on February 18, 2018, or have information about where he might have gone after leaving the taxi?