[dragonwriter]

> What King killed people at the red wedding?

Certainly none doing the stabbing in person as described; there's certainly instances in GoT of people claiming the title King killing people personally in GoT, but the Red Wedding is equally certainly not one of them. A key aspect of the Red Wedding was that the Lord directly overseeing the killing (who also wasn't doing it personally) was (perceived up to that point to be) an ally of the targets who were his guests, and (again, perceived) opponent of the King (Joffery) whose cause was served by the killing.