I've had this happen I guess two or three times.
In each case it was not a person I knew, but at the conclusion of a physical struggle with a stranger.
The one I really remember I can't recall anything about how the fight started, but in the course of the fight both of us had our hands on a handgun. I 'realized' in the dream my life was on the line, and I managed to get the barrel pointed at my opponent and pulled the trigger.
Woke up almost immediately, and recalled that within the dream (and obviously afterwards when I realized I was dreaming) I was completely remorseless.
In each case it was not a person I knew, but at the conclusion of a physical struggle with a stranger.
The one I really remember I can't recall anything about how the fight started, but in the course of the fight both of us had our hands on a handgun. I 'realized' in the dream my life was on the line, and I managed to get the barrel pointed at my opponent and pulled the trigger.
Woke up almost immediately, and recalled that within the dream (and obviously afterwards when I realized I was dreaming) I was completely remorseless.