Melody Thomas Scott (Nikki Newman) is doing a little moonlighting. The long-time Y&R star recently taped an episode of ABC's primetime detective show, Castle.

Scott will play the role of Tonya Wellington.

A rep for Castle describe's Scott's character as "a wealthy woman who was a client of the murder victim -– a well-known matchmaker."

Apparently, Tonya Wellington met her husband via the matchmaker, but she and her husband are estranged after she learned that her husband was cheating on her. Could that be a motive for murder?

Scott is just the latest soap star to appear on Castle, which stars former One Life to Live heartthrob Nathan Fillion (ex-Joey Buchanan), who, in related news, has recently expressed a desire to make a cameo on his daytime alma mater. In October, Eden Riegel (Heather Stevens) made an appearance.

Scott's episode of Castle airs Monday, January 3 at 10:00pm Eastern/Pacific on ABC.