To quote you

Things that Samuel L Mothersmurfing Jackson knows about the Third-Party Killer

It is an account in play
It is an account still alive
It is likely to be, but not necessarily, male
It is not affiliated with town or mafia
It is a killer
-Sam doesn't know who it is just knows there is one

Okay.

I already said my theory to that. The only way of you knowing there is one is if you're an investigative or curing type role that exists solely because the other role exists, or you are the third party. That is basically a repeat of what I said earlier. I'm not going to lynch someone because you think they might be the killer. You need to have more proof.