Zach Galifianakis has dropped out of the supernatural buddy action/comedy "R.I.P.D." says Deadline. Ryan Reynolds will play a young cop murdered in the line of duty who agrees to enlist in the 'Rest In Peace Department', a police force of ghosts, for the chance to catch his killer. The action follows a regular day in the life of him and his partner, a gunslinger who himself has been dead since the 1800s.