That Girl Some where I have to agree with Ygrec23, "When interpreting dreams, only you can do it. Only you understand yourself sufficiently to be able to tell what the dream really means."

and "please be aware that huge numbers of people have such dreams who never commit the slightest crimes."

When i am upset with people, angry or frustrated, I can have some disturbing dreams including killing others, I am not a killer in life, I don't even get into physical fights.

Dreams I have been told are some times releases for our conscious mind, of stress that we are in real life...
There are a lot of websites out there with help interpreting dreams, but even then it goes back to what does it mean to you.

Be well and hope you better dreams