I can recall two recent dreams I've had that involved me killing someone.
PS. Not suitable for young ones. You've been warned.
The first dream involved a man who wanted me to offer my life so he can use my organs for whatever sick needs he wanted them for. In a part of the dream his face was covered in a shadow, but when his face was finally revealed, it was practically half burned and disfigured.
When he had me cornered near a pool, and being a dream, I ended up having super powers. I spread a circle of fire around him causing him to burn. I then proceeded to throw his burning body into the pool (where's the logic in that?). When I magically raised his body out of the water in a sphere or water, he managed to escape. When he came after me, I suddenly had a large axe and quickly chopped his body into pieces.
In my second dream, which actually occurred last night, I dreamed my sister was almost attacked by this strange man. When I chased after him I found an axed (what's up with the reoccurring axes?) and basically rammed it through his skull Rick Grimes style.
I don't know what my sub-conscience was telling me with these dreams, but maybe if I'm pushed far enough or if a person I love is in danger I'm perhaps capable of killing someone? I don't know.
These dreams were pretty gruesome.