I Know What You Did Last Summer star Jennifer Love Hewitt will narrate and executive produce They Know What They Did, a docuseries exploring a group of interconnected individuals haunted by a murder from their past.

Blending a kaleidoscope of perspectives, each episode charts the journey to confront what really happened, revealing secrets and uncovering the truth. The stories unfold through first-person accounts of friends, family, locals, journalists and law enforcement.

The show will premiere this summer on Investigation Discovery and HBO Max, likely coinciding with the release of the new I Know What You Did Last Summer on July 18.

Hewitt and Freddie Prinze Jr. reprise their roles from the 1997 slasher in the legacy sequel alongside Madelyn Cline (“Outer Banks”), Chase Sui Wonders (Bodies Bodies Bodies), Jonah Hauer-King (The Little Mermaid), Tyriq Withers (Him), and Sarah Pidgeon (“The Wilds”).

When five friends inadvertently cause a deadly car accident, they cover up their involvement and make a pact to keep it a secret rather than face the consequences. A year later, their past comes back to haunt them and they’re forced to confront a horrifying truth: someone knows what they did last summer… and is hell-bent on revenge.

As one by one the friends are stalked by a killer, they discover this has happened before, and they turn to two survivors of the legendary Southport Massacre of 1997 for help.

Jennifer Kaytin Robinson (Do Revenge) directs from a script she co-wrote the script with Sam Lansky, based on a story by Robinson and Leah McKendrick (M.F.A.).