Julie finds an article mentioning Susie 's father, Ben Willis, and realizes it 's Ben they ran over, moments after he had killed David Egan to avenge his daughter. She then goes to the docks to tell Ray, who 's skeptical. Julie notices Ray 's boat is called "Billy Blue '' and runs away before Ray can explain that he went to see Missy to relieve his conscience. Ben shows up, knocks Ray out and invites Julie to hide on his boat. Looking around, she finds photos and articles about her and her friends, and pictures of Susie. Ben 's boat leaves the docks, as Ray regains consciousness and steals a motorboat to rescue Julie, who 's being chased all around Ben 's boat. Ray ultimately uses the rigging to sever Ben 's hook - carrying hand and send him overboard. When the police question them, they deny knowing why Ben attempted to kill them, but they 're relieved not to have actually killed anybody the previous summer, and reconcile.
who was the murderer in i know what you did last summer
Ben Willis