[mr beer]

It's rare but not unheard of. Kind of depends on the type of game I'm running. I like long running campaigns which become somewhat flavourless IMO if you have high PC turnover. Sometimes I run more meatgrinder-style dungeon bashes, in which case character death is more common.

Reasons for PC death in my games are usually a) bad luck coupled with a tough encounter or b) poor tactical player decisions and c) player is bored of that character and wants them killed off instead of retiring (generally resolved via option b).