Zac Efron & Marcia Gay Harden Join Ensemble JFK Conspiracy Film PARKLAND

Zac Efron, Marcia Gay Harden have officially signed on to join Paul Giamatti, Billy Bob Thornton, and Jacki Weaver in PARKLAND, the upcoming film based upon John F. Kennedy's assassination. Tom Hanks and Gary Goetzman are set to produce through Playtone, with Exclusive Media financing the flick. Nigel Sinclair and Guy East are financing the film.

PARKLAND retells the true story of the devastating events that unfolded at Parkland Hospital in Dallas on the day President John F. Kennedy was assassinated in November 1963. The film is tentatively set to be released in 2013, to mark the 50th anniversary of the assassination.

"Zac Efron continues to impress us with his recent shift into more dramatic roles which showcase his exceptional acting skills and Marcia Gay Harden is an unparalleled actress who gives tour de force performances in every film she appears. We look forward to seeing their combined talent in Peter Landesman's powerful and mesmerizing story alongside the excellent cast already attached to this film," said East and Sinclair in a statement.

PARKLAND is based upon Vincent Bugliosi's book RECLAIMING HISTORY: THE ASSASSINATION OF PRESIDENT JOHN F. KENNEDY.