John William Anglin was 32 when he and two other inmates—his brother Clarence Anglin and Frank Morris—disappeared from Alcatraz Federal Penitentiary on June 11, 1962. The three men dug through their cell walls, climbed to the roof, and put to sea on a makeshift raft made from raincoats after the escape. Authorities recovered some items in the bay, including a paddle and a life vest, but no bodies were found and the trio were never conclusively located.

Officials at the time concluded the strong currents likely carried the men to their deaths, but over the years leads, sightings, and other pieces of evidence have suggested one or more may have survived. A letter allegedly from John Anglin was sent to the San Francisco Police Department in 2013 claiming he was alive; the letter’s authenticity has been questioned. The U.S. Marshals continue to list the escapees as fugitives.

If anyone has reliable information about John Anglin’s whereabouts after June 11, 1962, please share it.