YOU SAID:

I accidentally ran over my cat, It died immediately on impact.

INTO JAPANESE

誤って猫に轢かれましたが、衝撃ですぐに死んでしまいました。

BACK INTO ENGLISH

I was accidentally run over by a cat, but I was shocked and died immediately.

INTO JAPANESE

偶然猫にひかれたのですが、ショックですぐに亡くなりました。

BACK INTO ENGLISH

I happened to be run over by a cat, but soon died in shock.

INTO JAPANESE

たまたま猫にひかれたのですが、すぐにショックで亡くなりました。

BACK INTO ENGLISH

I happened to be run over by a cat, but soon died in shock.