Ken Baumann isn't the only actor who will be finding romance on Castle.

A few days after the show announced that Secret Life of the American Teenager star would be dating the title character's daughter on this ABC hit, Victor Webster has also been revealed as a key guest star.

The actor will play Josh Davidson, a love interest for Kate with "an element of mystery to him,” producer Andrew Marlowe told EW.com. “He’s more of a motorcycle guy... A person that is going to intrigue Castle, because he’s going to see a different side of Beckett.”

Webster will debut on the show's fourth season three episode, as Castle returns on Monday, September 20.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.