We reported a few weeks ago that Lionsgate was picking up a new Katherine Heigl film and now the supporting cast is starting to fill out. Variety is reporting that Jason O'Mara has signed on for a supporting role in One for the Money.

The film is based on the first novel in Janet Evanovich's Stephanie Plum novel series and follow's Heigl playing Plum, who has hit rock bottom at the age of 30. She is recently divorced and ends up taking a job in her shady cousin's bail bond business. Her first big case ends up being a cop who is wanted for murder, who is also a former high school boyfriend, to be played by O'Mara. Daniel Sunjata has also joined the cast of the film as a a feared bounty hunter.

Julie Anne Robinson is directing the film from a script by Liz Brixius. No production schedule was given for the film.