Daniel James Roebuck (born March 4, 1963) is an American actor and writer. His best known roles include Deputy Marshal Robert Biggs in The Fugitive and its spinoff film U.S. Marshals, Jay Leno in The Late Shift, and Dr. Leslie Arzt in Lost, as well as numerous Rob Zombie and Don Coscarelli films. He is also known for his role as Cliff Lewis, Ben Matlock's private investigator, on Matlock from 1992 until 1995.