An unidentified male extra died on the New York City set of The Dark Knight Rises last month after suffering a heart attack. The extra wandered off between rehearsal takes, and was later discovered unconscious. Warner Bros. confirmed the news with a brief statement, which you can read below.

"The studio can confirm that a male extra passed away while on a break during an off-set crowd rehearsal for a sequence with several hundred extras... in early November. Production fully cooperated with the authorities' investigation, which established that he died of natural causes."
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The extra was reportedly rehearsing a scene where Bane (Tom Hardy) leads a group of escaped Arkham Asylum convicts in a huge melee scene with the Gotham Police. No principal cast members or filmmakers were present when the heart attack occurred.

This is the third death on a major studio production in the last few months. A stuntman died on the set of The Expendables 2 in October, and a G.I. Joe 2: Retaliation crew member passed away last month.