Tom Selleck, Catherine o'Hara board 'Five Killers'

Tom Selleck, Catherine O'Hara and Martin Mull have signed on to star in Robert Luketic's upcoming comedy "Five Killers."

Kutcher stars as a hitman who decides to quit killing business when he falls in love with the woman of his dreams (Heigl). Years later, however, he finds out somebody out there has been hired to kill him.

Luketic, whose credits include "21" and "Legally Blonde," is directing Bob DeRosa's original script, which Ted Griffin revised.

According to the Hollywood Reporter, Selleck and O'Hara will play Heigl's parents. Mull is on board to play Kutcher's handler.

Selleck recently starred in "Las Vegas" and "Jesse Stone: Thin Ice." Of course, he's best known for his role as Thomas Sullivan Magnum, IV on "Magnum, P.I."

As for O'Hara, her recent credits include "Penelope" and "For Your Consideration." Mull appeared on "Sabrina, the Teenage Witch" and "Roseanne."