By the time John McClellan Jr. was found dead inside Pennsylvania’s State Correctional Institution (SCI) at Cresson last May, he had long been categorized as “special needs” for his history of addiction and mental instability. Yet prisoners and staff say the 42-year-old inmate was not living in one of the facility’s treatment units but in the Restricted Housing Unit, or RHU—otherwise known as solitary confinement.