In Britain, there have been high profile killers (and more) baptised. Male and female. Here's one of them:
If we'd had death penalty in this country though he'd not have been alive long enough to convert. As it is, he's planning his funeral inside.
They've changed their ideas on Armageddon and what happens I believe. I think the current idea is that there's a certain point after which you're doomed and just get to listen to the JWs telling you that they told you so. But the finer detail of their current beliefs escapes me at times. A resurrected murderer would get a 1000 year panda hugging holiday in paradise just like your average JW, and then they get the final test. Which makes you wonder about the benefits of conversion and explains why the WBTS is so keen on always having the end arriving tomorrow.