Douglas was last seen by a neighbor in early September 2017. The neighbor arrived at his residence to pick him up for a scheduled medical appointment and found the residence unlocked; however, Douglas was not present. Prior to his disappearance, his behavior had become increasingly erratic. He had reportedly been found on several occasions outside his residence, unclothed, and wandering in the wooded area near his home. The surrounding area was searched, but Douglas could not be located.