I've killed in my non-lucids, but always in self defense. Mostly it's been with knives, but one time I slammed a guy's head into the wall over and over.

My suicide attempts have failed. One time I shot myself in the head because I had become a vampire and didn't want to have to drink blood to survive. My vision went black but I remained conscious and didn't understand why nothing was working. A few other times I attempted suicide because the world was ending.