Killer
I know there is an argument about whether or not Chris Penn's character killed the girl the fishermen find in the water or not.
I personally feel that he didn't kill her as to me the film shows the slow burn of his inadequacy till her finally snaps.
However since many of the characters in this film are connected do you think any of the other characters shown may have killed the girl in the water. I feel like she was mostly a prop used to show the nature of the fishermen and Claire the clown as well as a foreshadowing for the suicide and the murder towards the end, but perhaps there are clues another character is responsible.