YOU SAID:

I would have killed you for it

INTO JAPANESE

私はそれのためにあなたを殺したでしょう

BACK INTO ENGLISH

I will have killed you for that

INTO JAPANESE

そのためあなたを殺したでしょう

BACK INTO ENGLISH

So you killed you

INTO JAPANESE

だからあなたはあなたを殺しました

BACK INTO ENGLISH

So you killed you