It’s fine to deport him. As for further prosecution, I don’t necessarily see the value in doing so. He’s 95 and you can’t take back the life he’s already lived. Any punishment such as prison is in the Bernie Madoff mold. He doesn’t care, he’s already had “the time” of his life. Sure, he could/should die in prison, but of what real deterrent/punishment is it?
If the man is provably guilty of murder or some worse capital crime, prosecute and if found guilty execute him. There is no time limitation on punishing murder as far as I know.
If he is not going to be prosecuted for a capital crime then just let it go after all this time.
It looks like what we are actually witnessing is preening social justice. Youngsters getting tough on a 95-year old but unwilling, or unable, to make a case that their grandfathers could and would have made if our nation had thought it appropriate way back then.