YOU SAID:

If you see this someone else has died

INTO JAPANESE

これを見たら誰かが死んだことになる

BACK INTO ENGLISH

If you see this, someone must have died.

INTO JAPANESE

これを見たら誰かが死んだはずだ。

BACK INTO ENGLISH

Someone must have died after seeing this.

INTO JAPANESE

これを見て誰かが亡くなったに違いない。

BACK INTO ENGLISH

Someone must have died watching this.

INTO JAPANESE

これを見て誰かが亡くなったに違いない。

BACK INTO ENGLISH

Someone must have died watching this.