I'd like to submit Julia Ray for consideration.
I'd create her as a 1st level, but she was made for the WotW campaign starting at Book 2 anyway.
I have played until the escape of the prison, so not very far, and it was ages ago so I don't remember much of it.
She is effectively a sniper, and takes out those she is either paid to, or those who she believes need to be dead for the greater good (the greater good being Asmodeus being back in charge)
Her crime is murder, because Julia never leaves a target alive.