YOU SAID:
The police arrested me because I killed my family.
INTO JAPANESE
私の家族を殺されたために、警察が私を逮捕しました。
BACK INTO ENGLISH
Because my family was killed, police have arrested me.
INTO JAPANESE
私の家族が殺されたために、警察は私を逮捕しました。
BACK INTO ENGLISH
Because my family was killed, police have arrested me.
That didn't even make that much sense in English.