Cillian Murphy Joins I'm.mortal

One property I’m really looking forward to Andrew Niccol's I'm.mortal is locking down its cast.
Heat Vision reports Cillian Murphy (coming off the wild success of Inception) will join Justin Timberlake and Amanda Seyfried in the sci-fi action/drama.
The film is set in a future where the aging process has become a commodity where upper class society pays for their youth and immortality. The main story involves Timberlake as a poor schmoe entangled in a murder mystery and on the run with an heiress (played by Seyfried).
Murphy will play a member of the Timekeepers, those chaps who keep tabs on the aging and presumably billing as well.