"Dark Knight Rises" extra dies on set

(CBS) A male extra in Christopher Nolan's "The Dark Knight Rises" died of natural causes on set in early November.

A Warner Bros. rep confirmed the news to the New York Post on Thursday, while a source revealed the unidentified background actor died from heart attack during rehearsals in New York. He had walked away from filming during a break and was discovered unconscious close by.

"He was taken immediately to the hospital," said the source. "It was during a period when the film was shooting a huge sequence with several hundred extras in the Wall Street area. But the male extra had been rehearsing in another location away from the set. While on a break, he'd walked away and died of natural causes."

No principal cast or filmmakers were on set at the time, according to the studio.

The upcoming Batman film, which stars Christian Bale, Tom Hardy and Anne Hathaway, hits theaters in July.