Writer-director Jennifer Kaytin Robinson couldn't bring Sarah Michelle Gellar's Helen Shivers back to life for this sequel. In a conversation with Entertainment Weekly, Robinson said she "tried relentlessly" to fit Gellar into the new "I Know What You Did Last Summer." Her efforts were for naught because Robinson could not maneuver around the fact that Helen Shivers is dead. "I tried, okay? I harassed her! But she is dead," Robinson said. "I tried to pitch some crazy shit too. I was like, 'What if it's like you weren't dead and you're actually alive, but in hiding?' And Sarah's like, 'I was on ice. I was the most dead a person could be. You can see my frozen body.' I was like, 'Yeah, but what if?' And she said, 'I am dead. I am Sarah Dead Gellar.'"
(23 September 2024) Freddie Prinze Jr. announced he signed on to reprise his role as Ray Bronson in the new sequel.
(13 December 2024) Jennifer Love Hewitt officially announced she would be returning as Julie James in the new sequel.