YOU SAID:

I was really sad when I found out that my fish was murdered.

INTO JAPANESE

私の魚が殺されたと知ったときは本当に悲しかった。

BACK INTO ENGLISH

When I found my fish had been killed and that was really sad.

INTO JAPANESE

見つけたとき私の魚が殺され、本当に悲しかった。

BACK INTO ENGLISH

When I found my fish have been killed, and that was really sad.

INTO JAPANESE

見つけたとき私の魚が殺されているし、本当に悲しかった。

BACK INTO ENGLISH

And when I found my fish have been killed, and that was really sad.

INTO JAPANESE

私が見つかりました私の魚が殺され、本当に悲しかった。

BACK INTO ENGLISH

I found my fish were killed and that was really sad.

INTO JAPANESE

見つけた私の魚が殺され、本当に悲しかった。

BACK INTO ENGLISH

I found my fish were killed and that was really sad.