‘Supermax’ inmate with longest solitary confinement dies

This photo taken on February 13, 2019 shows a view of the United States Penitentiary Administrative Maximum Facility, also known as the ADX or "Supermax", in Florence, Colorado. (Photo by Jason Connolly / AFP/Getty Images)

FLORENCE, Colo. — An inmate at the “Supermax” prison in southern Colorado who had been held in solitary confinement longer than any other federal prisoner, has died at the age of 67.

Thomas Silverstein, who was held in solitary confinement for 35 years, was admitted to a Lakewood hospital in February to undergo surgery and died in intensive care May 11.

He entered prison in 1978 on an armed robbery conviction and was later found guilty of killing two inmates and a prison guard.

The Denver Post┬áreports┬áthat with no federal death penalty in place at the time of the guard’s slaying, the Bureau of Prisons instead put Silverstein in indefinite solitary confinement, where he remained until he was hospitalized.

He was moved to “Supermax” in Florence in 2005 and was housed in a soundproof cell.

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