YOU SAID:
a kitten murdered my friend
INTO JAPANESE
子猫は私の友人を殺害しました。
BACK INTO ENGLISH
Kitten is killed a friend of mine.
INTO JAPANESE
子猫を殺した私の友人。
BACK INTO ENGLISH
A friend of mine killed a kitten.
INTO JAPANESE
私の友人は、子猫を殺した。
BACK INTO ENGLISH
A friend of mine killed their kitten.
INTO JAPANESE
私の友人は、その子猫を殺した。
BACK INTO ENGLISH
My friend killed their kitten.
INTO JAPANESE
私の友人は、その子猫を殺した。
BACK INTO ENGLISH
My friend killed their kitten.
That didn't even make that much sense in English.