David Thomas Block, known as Dave, was 35 when he was last known to have been seen in Washington, D.C., on May 1, 1995. He is described as a White male with blond or strawberry-blond hair, blue eyes, about 5 feet 8 inches to 5 feet 9 inches tall and roughly 154 pounds, with short straight hair and no known scars or tattoos.

His disappearance has strong ties to Canada: he was reported missing to police in Swastika, Ontario, and the investigating agency is identified as Kirkland Lake OPP. Earlier public sightings place him in Newfoundland in 1994, then in Washington, D.C. on May 1, 1995, after which there are no further documented contacts. NamUs lists him as Missing Person MP22333 with last contact May 1, 1995, and family DNA reference samples are associated with CODIS.

Does anyone have information about his movements in 1994–1995 or contacts who might help fill the timeline?