YOU SAID:

a killer killed a killer now a killer gone

INTO JAPANESE

キラーがキラーを殺した今キラーがいなくなった

BACK INTO ENGLISH

The killer killed the killer Now the killer is gone

INTO JAPANESE

キラーがキラーを殺した今、キラーはなくなった

BACK INTO ENGLISH

Now that the killer has killed the killer, the killer is gone

INTO JAPANESE

キラーがキラーを殺したので、キラーは消えました

BACK INTO ENGLISH

The killer disappeared because the killer killed the killer

INTO JAPANESE

キラーがキラーを殺したのでキラーは姿を消した

BACK INTO ENGLISH

The killer disappeared because the killer killed the killer