Apart from Raymond Weinstein, are there any other examples of chess players of at least Master strength who committed murder?
Claude Bloodgood, the popularizer of the Grob (1. g4), must be far and away the most famous. At one stage his USCF rating was second only to Gata Kamsky! It doesn't get much worse than murdering your own mother.
I don't think Alexander Pichushkin played at Master level, but wikipedia implies that he was quite a strong player.