The Reason Behind The Letter
In his letter to the FBI, John Anglin claims that the two other prisoners, brother Clarence, and Frank Morris, had passed away in 2008 and 2005 respectively, and was the only remaining member of the trio alive.

The ultimate goal of Anglin’s letter was to make a deal with the FBI. It turns out that this man claiming to be John Anglin has cancer, and wanted to make a deal in which he’d turn himself in and serve his time in exchange for cancer treatment. Now, out of the blue, the case that was an unsolved mystery is thrown back into the spotlight.