I had a dream where i killed someone who is already dead?

I had a dream last night where i viciously killed a friend who has already passed away ( she was murder in 2008, shot 8 times, 16 year old girl) after i murdered her my cousin, niece and nephew helped me bury the body somewhere no one would ever find her, then we packed up all our things in an apartment we where living in (in real life we don't live together, they live about 4 hours away from me). As we where putting the things in the car i had the shovel that i used to bury her body with and my cousin took it and said we can take this with us ill make sure to get rid of it. Then i started to realize i was going to get caught and i was going to spend the rest of my life in jail and then all of a sudden i realized i didn't kill her she was already dead. Then my dream turns into her standing there as i watch her get shot by 2 guys over and over and my dream ends