<P> 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 . </P>
<P> 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 . </P>
who killed katie in the movie mystic river
who killed katie in the movie mystic river
Dave
Dave