We'ver been told all sorts of things. I read that when he was moved from solitary, he was placed in a double which had a bunk bed. And, that he hung himself from the top of the bunk bed by kneeling over and putting his weight on a dangling noose. I have to say, that takes a lot of willpower... or some assistance, either via pre-suicide drug administration, or by manual help during the act.
Sooo.... they put a suicidal guy in a cell with a bunk bed? They could have left him with a cyanide tablet and a loaded pistol too, just in case. Sheesh!
The shrieking was likely Jeffrey as the killer choked him out.