I read this yesterday and it was useful:
Later on, the prosecution notes the lack of violence while in jail as evidence for guilt because "he knows we've listed ... that he will be violent. He's not stupid." So his violence or lack thereof while imprisoned both count towards his guilt. That's just wrong.
On the other side, his story doesn't seem to hold up to much. Not that this is good enough to deal death to him, but one can see where the prosecutor is coming from. The guy admitted to covering up the murder, and there doesn't appear to be any plausible excuse.