By Michael Ausiello
October 11, 2010 at 11:52 PM EDT

Image Credit: Michael Kovac/FilmMagic.comFormer Lost castaway Harold Perrineau is returning to ABC—for one week anyway: The actor has booked a guest stint on The Whole Truth, sources confirm to me exclusively.

Perrineau will play Paul Braun, a psychic who leads the NYPD to the body of a young woman. This apparently isn’t the first time Braun has helped the police locate a dead body, but this is the first time he becomes the prime suspect.

The gig reunites Perrineau with his former Oz costar (and Truth regular) Eamonn Walker.

Truth has struggled to find an audience on Wednesdays at 10 PM, although the Maura-Tierney-Rob Morrow drama did post a nice increase last week. Is that momentum I smell? Well is it?!