they only keep bed sheets away from those they think might try suicide?
I was in the big house for 25 years. Inmates placed in MHCB ( mental health crisis beds) were put there with only a suicide vest, till they were no longer in crisis.
I doubt this dude had a cellie. No cellmate is going to allow his cellie to commit suicide. He will be screaming bloody murder, for staff to intervene, because he would be the prime suspect. The entire housing unit would know about it, as they would all hear it. If a dude is going to off his cellie, hanging him by a bedsheet, would be the last thing he would try to do. He would be screaming that his cellie was trying to kill him, and once again, the entire housing unit would hear it. The guy did himself in.