Quick Answer
The killer in I Know What You Did is played by actor Sean Young, who portrays the character Helen Shivers. The film follows a group of friends stalked after a hit-and-run accident.
Plot Context
After accidentally hitting a pedestrian, the group decides to hide the body and swear secrecy. Later, a masked killer begins targeting them, and suspicion falls on each member as secrets unravel.
Cast and Character Details
Helen Shivers, portrayed by Sean Young, is one of the central friends drawn into the escalating danger. The killer’s identity and motives are revealed as part of the thriller’s twists.
Film Background
I Know What You Did is a 1997 slasher thriller directed by Jim Gillespie and written by Kevin Williamson. It was produced as a follow-up to the success of Scream and other late-1990s horror films. For more background, see the film overview on IMDb.
