By EW Staff
Updated June 29, 2008 at 04:00 AM EDT

(FROM PEOPLE) ? The upcoming Batman movie, The Dark Knight, includes a posthumous tribute to star Heath Ledger, who died of an accidental drug overdose in January. The movie’s closing credits will include a line that reads, ”In memory of our friends Heath Ledger & Conway Wickliffe.” Wickliffe was a special-effects technician who was killed last September in a stunt-car accident. Ledger plays the Joker in the Christopher Nolan-directed Knight, which opens July 18. Christian Bale stars as the caped crusader, and Michael Caine, Morgan Freeman, Gary Oldman, and Maggie Gyllenhaal also have roles. (