He would have been paroled after 25 years
No he wouldn't. None of these guys get parole at the first attempt, certainly not someone serving 22 life sentences.
Had he lived, what actually would have happened is some other charges would have been brought at some point while he was in prison, so topping up his sentence and adding on to the 25 years. Then he would have been turned down for parole a few times - add on at least another 5-10 years for that.
So Instead of 25 years, you are now looking at 35-40 years. Which is a long time in prison - having gone in at 33, it's a life sentence.
That's without charges being submitted from another country and him being extradited there at the end of his sentence to serve there.
He was never getting out.
I would rather he had served his punishment for all those years. Plus he will have been on a Vulnerable Prisoner Wing - the person who stabbed him isn't a hero, they will be convicted of offences just as vile as him.