 
<translate> Nye ụfọdụ iyi nke nsụhọ na mgbe ahụ azịza ya. Jimmy na ndị enyi ya mere ka Dave ṅụbiga mmanya ókè n'ụlọ mmanya dị n'ógbè ahụ. Mgbe Dave hapụrụ ụlọ mmanya ahụ, ndị ikom ahụ sooro ya pụọ. Jimmy gwara Dave na ya gbagburu "Just Ray" Harris n'otu ebe ahụ maka ịgba ya mgba na iziga ya n'ụlọ mkpọrọ. Jimmy gwara Dave na nwunye ya chere na ọ bụ ya gburu Katie ma gwa Dave na ya ga-ahapụ ya ka ọ dị ndụ ma ọ bụrụ na o kwupụta. Dave na-agwa Jimmy ugboro ugboro na o gburu mmadụ mana ọ bụghị Katie: ọ kụrụ onye na-emetọ ụmụaka ihe ruo ọnwụ mgbe ọ hụrụ ya ka ya na nwata akwụna na-enwe mmekọahụ n'ụgbọala. Jimmy ekwetaghị ihe Dave kwuru ma jiri mma yie ya egwu. Mgbe Dave mechara kweta na ya gburu Katie na-eche na ya nwere ike ịgbanahụ ndụ ya, Jimmy gburu ya ma tụba ozu ya n'osimiri Mystic dị nso.  Dabere n'ihe e kwuru ebe a, ònye gburu Katie na fim Mystic River? <eng> Give some stream of consciousness and then the answer. Jimmy and his friends get Dave drunk at a local bar. When Dave leaves the bar, the men follow him out. Jimmy tells Dave that he shot "Just Ray" Harris at that same location for ratting him out and sending him to jail. Jimmy informs Dave that his wife thinks he murdered Katie and tells Dave he will let him live if he confesses. Dave repeatedly tells Jimmy that he did kill someone but it was not Katie: he beat a child molester to death after finding him having sex with a child prostitute in a car. Jimmy does not believe Dave's claim and threatens him with a knife. When Dave finally admits to killing Katie thinking he can escape with his life, Jimmy kills him and disposes of his body in the adjacent Mystic River.

Based on this passage, who killed katie in the movie mystic river? 