Dream about someone killing a cat is a symbol for a difficult or emotional situation that you are trying to process and understand. Perhaps it is not who you really are and you are not quite fitting in. You do not know what direction to take. This is a portent for confusion and ambiguity in the direction of your life. You are not reaching out to others enough.
Someone killing a cat dream is a symbol for the limited time you have to react or to do something. You may not be taking responsibility for your decisions. You are lacking adventure in your life. It is a clue for expressions of amazement, disbelief, surprise, or doubt. You are headed in the wrong direction.
If you dreamt about someone killing a cat:
It would help if you could go a little deeper in your conversations with your beloved, rather than merely skirting over the surface because you are too embarrassed to say what you mean. The celestial configuration encourages the kind of conversations that you generally prefer to avoid, but which you would be wiser to attempt in order to clear the air. All you have to is to start talking.