YOU SAID:
I HAVE KILLED MY WIFE
INTO JAPANESE
私は私の妻を殺した
BACK INTO ENGLISH
I killed my wife
INTO JAPANESE
私は妻を殺した
BACK INTO ENGLISH
I killed my wife.
INTO JAPANESE
私は妻を殺した。
BACK INTO ENGLISH
I killed my wife.
That didn't even make that much sense in English.