who killed (someone or something)A noun-modifying phrase made from 를, the object marker, and 죽인, the past attributive form of 죽이다 (“to kill”). It must be attached to the noun or noun phrase being described; for example, 를 죽인 놈 means “the guy who killed someone.” The object marked by 를 appears before the phrase, as in 친구를 죽인 (“who killed [my] friend”).