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David Fincher's next film "Zodiac," which is based on the real-life tale of a serial killer known as the Zodiac Killer, who terrorized San Francisco for 25 years, has attracted new actors, including Mark Ruffalo, Jake Gyllenhaal and Robert Downey Jr.. The Hollywood Reporter writes, Mark Ruffalo is in talks and Jake Gyllenhaal and Robert Downey Jr have signed on to appear in the movie.

Gyllenhaal is said will play Robert Graysmith, the journalist and author of the two books, Zodiac and Zodiac Unmasked. Downey, at the same time, will play fellow reporter Paul Avery, and Ruffalo would play the San Francisco homicide inspector in charge of the case. The film supposedly will be produced by Pheonix Pictures and will be distributed by Paramount.