Killed at least three people w/o consent or with them saying not to. stole my stuff, i asked him to give back, he said no, so i took my stuff back when he died (of falling damage). asked him multiple times to stop killing, heard someone else tell him to not grief, and know that he'd obtained lightstone, which i'm pretty sure he only could've gotten through griefing/PK'ing.
Just noting that he is not even a member. Please comment to agree or add anything i missed.