The white supremacist was put in solitary confinement after he killed two inmates and a prison guard in 1983. This is second in a series on the world’s most violent prisoners. Silverstein was only 19 years old at the time of the crime. Silverstein, who had been held in solitary confinement for 35 years, was admitted to the hospital in February to endure surgical procedure, mentioned Dan Pruett, Jefferson County chief deputy coroner. Image credit: Thomas Silverstein prison artwork “Solitary Confinement” (PCM) A convict by the name of Thomas Silverstein entered the prison system back in 1975 when he was charged for his role in three bank robberies along with his father and uncle. Thomas Silverstein, who was held in solitary confinement for 35 years, was admitted to a suburban Denver hospital to undergo surgery and died in intensive care Thomas Silverstein was an inmate at the 'Supermax' prison in southern Colorado. Thomas Silverstein died Might 11 at St. Anthony Hospital in Lakewood. Thomas Silverstein, who was believed to have spent more time in solitary confinement than any other American federal prisoner, died from complications of heart surgery on … Silverstein served the longest term in solitary confinement of any prisoner at the federal super-maximum security prison in Colorado. Thomas Silverstein, 67, died in a Colorado hospital after being transferred there from jail with a coronary heart situation. Solitary confinement is a form of imprisonment distinguished by living in single cells with little or no meaningful contact to other inmates, strict measures to control contraband, and the use of additional security measures and equipment.It is specifically designed for disruptive inmates who are security risks to other inmates, the prison staff, or the prison itself.