What’s the actual point of releasing him? I can’t see one at all. It’s not as though he’s likely to get a job as his age so even more of a worry about what he’d be able to get up to with time on his hands.
There is no point, he should die in prison as should all murdering nonces. Until they can alter that section of their brain that makes them that way they will never change. If they have to be strictly monitored once released they should be in the place where they are fully monitored, a prison cell.