Lunney, last seen in Theresa Rebeck's Mauritius on Broadway, will succeed Patrick Ryan Sullivan in the role of Harrison Brent. Sullivan plays his final performance Sept. 28.

A Perfect Crime, written by Warren Manzi and directed by Jeffrey Hyatt, "tells the story of Margaret Brent, an accomplished Connecticut psychiatrist and potential cold-blooded killer. When her wealthy husband turns up dead, she gets caught in the middle of a terrifying game of cat and mouse with a deranged patient and the handsome but duplicitous investigator assigned to the case. As the clock ticks to the final chilling revelation, a mounting set of secrets and indiscretions leads to a shocking turns of events. Did Margaret Brent commit 'the perfect crime?'"

Lunney joins a cast led by longtime Perfect Crime player Catherine Russell, Michael Brian Dunn ( The Life), Patrick Robustelli and Richard Shoberg ("All My Children").

Perfect Crime opened as an Equity Showcase in 1987 and since moving Off-Broadway has been running for 21 years, making it the longest-running play in the history of New York theatre.

Lunney has also appeared in the Broadway companies of Deuce, The Graduate, A Doll's House, Dancing at Lughnasa and the Off-Broadway production The Dying Gaul. His screen credits include "Julie & Julia," "Flying Scissors" and "Law and Order." Tickets for Perfect Crime can be purchased by visiting Ticketmaster.com or by calling (212) 307-4100. The Snapple Theater Center is located at 210 West 50th Street at Broadway.