I Know What You Did Last Summer

The killer targets the four friends because they are responsible for accidentally killing his daughter, Susie, on July 4, 1996. After witnessing the hit-and-run, the friends panicked and disposed of Susie's body in the water, believing they could hide their crime. Ben Willis, Susie's father, discovered what happened and spent a year hunting them down to seek revenge for his daughter's death.

Early in the film, the friends' guilt over the accident is shown through their distant behavior and nightmares.

Ben Willis is the father of Susie, the young woman the four friends accidentally hit with their car on July 4, 1996. After discovering his daughter's death was caused by the friends' hit-and-run and subsequent cover-up, Ben became the vengeful killer hunting them down. His motivation stems from grief and the desire to make the friends face consequences for leaving his daughter to die and concealing her death.

The mysterious figure referred to as Billy Blue is actually connected to Ben Willis's past, hinting at his identity.

Max, the acquaintance who witnessed the aftermath of the accident, is later murdered by Ben Willis. His body is found and then later appears in Julie's car trunk, wrapped in Barry's stolen jacket, which heightens the friends' paranoia and makes them believe one of them is responsible. The killer uses Max's death to further terrorize the group and frame them.

Max's murder is the second death connected to the friends' secret, escalating the stakes significantly.

The letter is Ben Willis's way of confronting the four friends about their crime. The phrase refers to the events of July 4, 1996, when they accidentally killed Susie and disposed of her body. By sending the letters, Ben forces them to relive their guilt while he systematically hunts them down. Each friend receives this ominous letter, confirming that someone knows their dark secret.

The letter arrives exactly one year after the accident, showing Ben has been planning his revenge.

Helen becomes the killer's initial target after the letters are sent because she was directly involved in disposing of the body, being the one who pushed Susie into the water. The killer invades her home and leaves behind severed locks of her hair as a threatening message, making the attack personal and terrifying. This marks the transition from threatening letters to actual violence.

Helen's involvement in the body disposal makes her a primary target for Ben Willis's rage.

Ray, who has been living as a fisherman, awakens just in time to save Julie from Ben Willis aboard a fishing boat. He intervenes during the killer's attempt to kill Julie, helping her escape the deadly confrontation. Their shared history and Ray's sudden appearance allow them to survive the night, though the killer's ultimate fate remains unclear.

Ray's transition to a quiet life as a fisherman foreshadows his reappearance at the climax.

The ending of the movie is deliberately ambiguous regarding Ben Willis's fate. While Julie and Ray appear to escape the immediate threat aboard the fishing boat, the final scene in 1998 shows Ben's hooks still present in Julie's college shower, and a figure crashing into her room with the words 'I still know.' This strongly implies Ben Willis survived and continues to hunt Julie, leaving the threat unresolved.

The relentless nature of the killer suggests he would not give up easily, even after apparent defeat.

David Egan is a local resident whose story becomes intertwined with the mystery surrounding the killer. Julie investigates David while searching for answers, discovering connections to a mysterious figure called Billy Blue, who is apparently a friend from David's past. However, the Billy Blue connection appears to be a red herring in the investigation, as the true killer is Ben Willis.

The investigation into David Egan and Billy Blue distracts from the actual revenge plot.

After Julie discovers Max's corpse wrapped in Barry's stolen jacket in her car trunk, she tries to show her friends the evidence. However, by the time they gather to look, the body has vanished. This disappearance is part of the killer's psychological manipulation, designed to make the friends doubt each other and themselves while he continues his deadly game.

The vanishing body amplifies the paranoia among the group, making them question reality.

Barry is brutally murdered during the Croaker Beauty Pageant in front of Helen because he was directly involved in the hit-and-run cover-up. He was one of the friends who helped dispose of Susie's body, making him a target for Ben Willis. The public, violent murder serves as both revenge and a message to the remaining friends.

Barry's death at a public event marks the escalation from threats to visible violence.

Elsa, Helen's sister, is brutally murdered in the family store, likely because the killer is targeting anyone connected to the four friends. Her death serves to further traumatize Helen and force her into desperate action. The murder demonstrates that Ben Willis will harm anyone close to those responsible for his daughter's death.

Elsa's murder represents the killer's willingness to expand his revenge beyond the primary group.