Given the question: The answer to the question: Who writes the word "Soon" in lipstick on a vanity mirror? is inside the article: On the Fourth of July 1996 in Southport, North Carolina, Julie James and her friends Ray Bronson, Helen Shivers, and Barry Cox drive to the beach after attending a party. While driving along a coastal byway, they accidentally hit a pedestrian. Julie's friend Max passes by them on the road. Julie reassures Max that everything is all right, and he leaves. After some arguing, the group decides to dispose of the body, dumping it in the water. They agree to never again discuss what had happened. A year later, Julie returns home from her college in Boston for the summer. Since the incident, the friends have gone their separate ways. Julie receives a letter with no return address, stating, "I know what you did last summer!" Disturbed, Julie tracks down Helen, who has returned to Southport to work at her family's department store after a failed attempt at an acting career in New York City. The girls take the note to Barry, who immediately suspects Max. They confront Max on the docks, and Barry threatens him with a hook. Julie meets Ray, who is now working as a fisherman; he unsuccessfully tries to reconcile with her. Later, Max is killed by a figure in a rain slicker wielding a hook. Barry discovers a note in his gym locker saying, "I know." He is then ambushed by the same assailant driving Barry's car. Meanwhile, Julie researches newspaper articles which lead her to believe the man they ran over was a local named David Egan. Helen and Julie go to visit with David's sister Missy at her home. Missy explains to them that their family was devastated by David's death; she also mentions that a friend of David's named Billy Blue also visited her to pay his last respects. Later that night, the killer sneaks into Helen's house, cuts off her hair while she sleeps, and writes "Soon" in lipstick on her vanity mirror., can you guess it ?
The answer is:
the killer