Heath Ledger will receive a special posthumous tribute at the end of his Batman movie, The Dark Knight. The movie’s closing credits will also acknowledge special-effects technician Conway Wickliffe, who was killed last September in a stunt-car accident. The send-off reads, “In memory of our friends Heath Ledger & Conway Wickliffe.” Heath Ledger, who died in January, plays the villainous Joker in the film, which opens July 18. It also stars Christian Bale as the Caped Crusader, as well as Michael Caine, Morgan Freeman, Aaron Eckhart and Maggie Gyllenhaal.