1997 . Horror, Thriller, Mystery . 1h 40m
As they celebrate their high school graduation, four friends are involved in a hit-and-run accident when their car hits and apparently kills a pedestrian on an isolated roadway. They dispose of the body and vow to keep the incident a secret, a year later somebody starts sending them letters bearing the warning "I Know What You Did Last Summer".
Jennifer Love Hewitt, Sarah Michelle Gellar, Ryan Phillippe, Freddie Prinze Jr., Bridgette Wilson
Lois Duncan (novel), Kevin Williamson (screenplay)
17 Oct 1997