WashingtonPost - "The questions have stymied law enforcement agencies, haunted family members and intrigued the public for more than half a century.
Did the three men who escaped in 1962 from Alcatraz — then known as the world’s most impenetrable island prison, a place for only the most hardened of criminals — survive their brazen attempt?
And, if so, are they still alive, nearly 56 years later?
To this day, Frank Morris, Clarence Anglin and John Anglin remain the only people who have escaped Alcatraz and never been found — a disappearance that is one of the country’s most notorious unsolved mysteries.
The prevailing theory is that Morris and the Anglin brothers drowned after leaving Alcatraz Island and attempting to cross the frigid San Francisco Bay.
But in a newly surfaced letter sent to San Francisco police in 2013 and obtained by CBS affiliate KPIX, a man claiming to be one of the escapees said that all three of the prisoners survived the attempt — but that he was the only one still living.
“My name is John Anglin,” the handwritten letter began. “I escape [sic] from Alcatraz in June 1962 with my brother Clarence and Frank Morris. I’m 83 years old and in bad shape. I have cancer. Yes we all made it that night but barely!”"