In the New York Times review of the film, critic Stephen Holden wrote:
"Both Mr. Ledger and Mr. Gyllenhaal make this anguished love story physically palpable. Mr. Ledger magically and mysteriously disappears beneath the skin of his lean, sinewy character. It is a screen performance, as good as the best of Marlon Brando and Sean Penn."
In another review in Rolling Stone, Peter Travers wrote:
"Ledger's magnificent performance is an acting miracle. He seems to tear it from his insides. Ledger doesn't just know how Ennis moves, speaks and listens; he knows how he breathes. To see him inhale the scent of a shirt hanging in Jack's closet is to take measure of the pain of love lost."
Also in 2005, Heath Ledger played a fictionalized version of Giacomo Casanova in Casanova. The film, a romantic comedy which co-starred Sienna Miller, drew mixed reviews from critics and failed to find a significant audience among general moviegoers. In 2006, Ledger was invited to join the Academy of Motion Picture Arts and Sciences. In 2007, he was one of six actors to portray different sides of singer Bob Dylan in the film I'm Not There. Ledger played iconic comic book villain The Joker in The Dark Knight, the sequel to the 2005 film Batman Begins, opposite fellow I'm Not There star Christian Bale. The film is set to debut on July 18, 2008. The film The Imaginarium of Doctor Parnassus, in which he had been cast, was in production at the time of his death.