Charles Esten Charles " Chip " Esten is the actor and singer who played Divok in the sixth season episode in . He later appeared in the episode as Dathan Alaris in . Born in Pittsburgh , Pennsylvania , Esten attended the College of William and Mary in Williamsburg , Virginia , where he met his future wife , Patty . After college , Esten moved to the United Kingdom , where he made his theatrical debut playing legendary singer Buddy Holly in the musical " Buddy " . He currently resides in Los Angeles , California with his wife and their three children . Television . To television audiences , Esten is best known for his numerous appearances on the improvisation comedy television series , . He was a recurring performer on both the original British version of the series as well as the later American adaptation hosted by Drew Carey . In addition to his roles on " Star Trek " , Esten has acted on such shows as " Cheers " ( starring Kirstie Alley and Kelsey Grammer ) , " Murphy Brown " ( in an episode with Peter Vogt ) , " Lois & Clark : The New Adventures of Superman " ( starring Teri Hatcher and K Callan ) , " JAG " ( with Daphne Ashbrook and Norman Large ) , " The Guardian " ( starring Raphael Sbarge ) , " Dragnet " ( with David Andrews and Saul Rubinek ) , " NYPD Blue " ( with Gordon Clapp , Scott Klace , Scott Alan Smith , and Michael Bofshever ) , and " Cold Case " ( with Cari Shayne and Robert Symonds ) . He also played Kelly Bundy ' s boyfriend in the final episode of " Married . . . with Children " and had a recurring role as Luke on " Party of Five " ( with Scott Grimes ) . Esten co - starred with Jeffrey Nordling , Natalia Nogulich , Julianna McCarthy , J . Patrick McCormack , Norman Parker , and Joel Polis in the 1997 television movie " The Sleepwalker Killing " . Two years later he appeared in the movie " Late Last Night " with John Carroll Lynch , Sarah Silverman , Steven Weber . Esten ' s subsequent television movie credits include 2002 ' s " The Johnny Chronicles " ( with Leon Russom ) and 2007 ' s " American Family " ( with Lisa LoCicero ) . In 2006 Esten had a recurring role as Josh Porter on the hit NBC sitcom " The Office " . He then appeared on " The New Adventures of Old Christine " , playing the brother of the title character ' s ex - husband . More recently , he played the recurring role of Dr . Barry Grossman on the long - running NBC drama " ER " , again working with Scott Grimes . He later played the recurring character of Damon on the HBO television series " Enlightened " . Esten currently stars as guitar player / band leader Deacon Claybourne on the ABC drama series " Nashville " . Film . Esten made his feature film debut in ' s 1997 post - apocalyptic drama " The Postman " ( which also features Ellen Geer ) . He reunited with Costner for a role in the acclaimed political thriller " Thirteen Days " . Co - starring with Esten in this film were fellow " Star Trek " alumni Bruce Greenwood , Steven Culp , Jack Blessing , Len Cariou , Kevin Conway , Tim Kelleher , Boris Lee Krutonog , Ed Lauter , Dakin Matthews , and Bill Smitrovich . The following year Esten appeared in the acclaimed HBO movie " 61 * " along with Seymour Cassel , Robert Costanzo , J . D . Cullum , Robert Joy , Bob Gunton , Christopher McDonald , Bruce McGill , Michael Nouri , Dell Yount and Connor Trinneer . Later , Esten starred opposite Chloe Sevigny in a segment of the anthology drama " Ten Minutes Older : The Trumpet " . This was followed with a supporting role in the 2003 independent comedy " Nobody Knows Anything ! " , co - starring Paul Dooley , Ed Lauter , Virginia Madsen and Scott Thompson . His most recent film was the 2008 comedy " Swing Vote " , his third film with Kevin Costner . This film also featured Kelsey Grammer , Mark Moses , and regular Nana Visitor .