I would sign something that would have a review
of his case. That he has been closely monitored for 30 years is probably a factor in keeping him from hurting himself or others. Now I don't see jail as a solution for him, but I also don't think just letting him free without supervision would work either. Someone with experience handling mental health issues and how it affects recidivism in violent crimes would have a better idea.
Ed Blackwell's daughter Nearin is another tragic case. She stabbed her boyfriend, who allegedly abused her, to death in 2005:
In both of these cases there are factors we don't know about; just what we read. But they should be brought out into the daylight.