Do serial killers ever retire?

They go dormant. Then come out and go for another run of it. Then due or get caught.

I think they go dormant but there can always be a trigger to pull them back in the game.

I have read details about some and they'll get triggered by stress during episodes in their life and start up again.

I studied Admin.of Criminal Justice and took Criminal Psychology courses. The textbook answer is that they do not stop until they are stopped.

Yeah, a lot like musicians. It's when the thrill is gone..

They just get soggy with milk

Not voluntarily