Finance Centre, as well as filming at Central to Mid-Levels escalator, The Center, Central, The Peninsula Hong Kong, and Queen's Road; and a stunt involving Batman catching an in-flight C-130 aircraft. Despite extensive rehearsals of Reeves jumping from the McClurg Building in Chicago, a planned stunt to depict Batman leaping from one Hong Kong skyscraper to another was canceled because local authorities refused permission for helicopter use; Pfister described the officials as a "nightmare". Christopher disputed a report that said a scene of Batman leaping into Victoria Harbour was canceled because of pollution concerns, saying it was a script decision. The 127-day shoot concluded on November 15, on time and under budget. Post-production Editing was underway in January 2008 when Ledger, aged 28, died from an accidental overdose of a prescription drug. A rumor his commitment to his performance as the Joker had affected his mental state circulated, but this was later refuted. Christopher said editing the film became "tremendously emotional, right when he passed, having to go back in and look at him every day [during editing]... but the truth is, I feel very lucky to have something productive to do, to have a performance that he was very, very proud of, and that he had entrusted to me to finish". Because Christopher preferred to capture sound while filming rather than re-recording dialogue in post-production, Ledger's work had been completed before his death, and Christopher did not modify the Joker's narrative in response. Christopher added a dedication to Ledger and stuntman Conway Wickliffe, who died during rehearsals for a Tumbler (Batmobile) stunt. Alongside lead editor Lee Smith, Christopher took an "aggressive editorial approach" to editing The Dark Knight to achieve its 152-minute running time. Christopher said no scenes were deleted because he believed every scene was essential, and that unnecessary material had been cut before filming. The Nolans had difficulties refining the script to reduce the running time but after removing so much material they believed it had become incomprehensible, they had added more scenes. Special effects and design Unlike the design process of Batman Begins, which was restrained by a need to represent Batman iconography, audience acceptance of its realistic setting gave The Dark Knight more design freedom. Chris Corbould, the film's special effects supervisor, oversaw the 700 effect shots Double Negative and Framestore produced; there were relatively few effects compared to equivalent films because Christopher only used