Ken Baumann is coming on board Castle.

The 21-year old actor, best known for portraying Ben Boykewich on ABC Family's The Secret Life of the American Teenager, will guest star on the fourth episode of this ABC hit's new season.

Titled "Punked," the installment will find Castle's daughter, Alexis, starting to date Baumann's Ashley. Look for the character/actor to recur on the show and, we're sure, cause major stress for the drama's title character.

TV Guide first reported this casting news.

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