A killer bank robber somehow strangled an inmate in another cell with a bedsheet ... penalty for Petty. ADX Florence is widely-regarded as the world's most secure prison for America's most ...

Ishmael Petty, who was separately convicted of assaulting prison employees, is the latest to face a possible death sentence ...

Petty, 56, was serving a life sentence at ADX Florence ... in 2015 of attacking two prison librarians and a case manager who were delivering books to his cell, prosecutors said.

Federal prosecutors are looking to pursue the death penalty for a man accused of killing a fellow inmate while in a Florence, ...

(AP Photo/Ben Curtis, File) Petty, 56, was serving a life sentence at ADX Florence ... of attacking two prison librarians and a case manager who were delivering books to his cell, prosecutors ...