Source: Variety

Anthony Edwards has signed on to join Mark Ruffalo, Robert Downey Jr. and Jake Gyllenhaal in Paramount and Warner Bros.' serial-killer thriller Zodiac, to be helmed by David Fincher.

Edwards, a four-time Emmy nominee for his work on "ER," will portray the partner of the lead police investigator on the case, played by Mark Ruffalo. Edwards' character suffers a nervous breakdown due to the assignment, Variety reports.

Jamie Vanderbilt is adapting from Robert Graysmith's nonfiction tome "Zodiac" and 2002 sequel "Zodiac Unmasked: The Identity of America's Most Elusive Serial Killer Revealed."

Production is scheduled for an August start.

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