YOU SAID:
i unfrtunently have killed your father
INTO JAPANESE
私は不意にあなたの父を殺してしまいました
BACK INTO ENGLISH
I accidentally killed your father
INTO JAPANESE
あなたのお父さんを誤って殺してしまった
BACK INTO ENGLISH
accidentally killed your father
INTO JAPANESE
誤ってあなたの父親を殺した
BACK INTO ENGLISH
accidentally killed your father
That didn't even make that much sense in English.