jon lee, the drummer from feeder (not sure if they're big in the states, but they're a really good UK pop-rock band), hung himself in 2002.
you could argue jeff buckley's death was kinda a suicide. having read up on the guy, and the events in his life at the time of his death (and what he had to say about them), i'd venture he probably knew that swimming in wolf river would more than likely result in drowning when he went in...