Federal investigations into the escape - which was immortalized in the 1979 film Escape From Alcatraz - concluded that the Anglin brothers and Morris must have drowned in the San Pablo Bay.
But for years, speculation has grown that the men may have survived and continued to live under cover, with theorists pointing to the fact that their bodies had never been recovered, and evidence that a raft was recovered on nearby Angel Island as well as evidence that a car was stolen on the mainland that night by three unidentified men.
Then in 2013, authorities received a handwritten letter suggesting that John may have still been alive, forcing U.S. Marshals to reopen the case in 2018.
It is unclear if there are any new developments in the investigation, but U.S. Marshals have now posted age-progressed photos of the wanted convicts.
On its
website, it describes Clarence as having a tattoo 'Zona' on his left arm, and 'Nita' tattooed on his right arm. He is described as having a scar on his right upper arm and a scar on his lip.
Clarence, who was sentenced to 15 years in prison for an armed bank robbery in Columbia, Alabama, would be 91 years old today if he is still alive.
His brother, John, meanwhile, is described as having a scar on his left cheek, another on his forearm and a third on his forehead. His photo was age progressed to 84, but if he were alive, John would be 92 today.
Officials also describe Morris - who has previously used the pseudonyms Carl Cecil Clark, Frank Laine and Frank Lane - as having a removed tattoo on his forehead, and scars on his left upper arm and left elbow.
He was sentenced to 14 years in prison for a bank burglary in Slidell, Louisiana, and federal authorities age-progressed his booking photo to the age of 88 - though he would be 96 if he were still alive.
Anyone with information about their possible whereabouts is asked to call the US Marshals San Francisco Office at (415) 436 - 7677 and press Option Two.
In a statement, officials said: 'The ongoing U.S. Marshals investigation of the 1962 escape from Alcatraz federal prison serves as a warning to fugitives: That regardless of time, we will continue to look for you and bring you to justice.' More photos at link:
United States Marshals have released age-progressed images of the three men who infamously dug their way out of the maximum security prison at Alcatraz Island on June 11, 1962.
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