Dream about having killed someone is a hint for how you process or handle your emotions. You are looking for protection in some area of your life. You are guarded about something in your subconscious. Your dream expresses a need for communication. You need to keep your head high even in difficult times.
Having killed someone dream signifies changes occurring in your life. You may be experiencing some unexpressed feelings. You need to be able to make clear distinctions between your choices. This is a metaphor for masculine aggression or power. That you are too demanding.
If you dreamt about having killed someone:
It’s altogether possible that the two of you won’t be able to see eye-to-eye today. One of you knows what you want, and how to get it both within the relationship and life in general; the other tends to give in and just go with whatever is taking place, whether they feel this is right for them or not. A balance needs to be struck.