He made his television writing debut on the NBC police drama Hill Street Blues.
Worth wrote the story and co-wrote the teleplay (with producer Ted Mann) for the first season finale "Rockin' Robin".
Worth wrote the teleplay for the episode "Don't Meth with Me" from a story by Milch and retired police detective Bill Clark.
He wrote the teleplay for four episodes - "A Hole in Juan", "Along Came Jones", "Little Abner" and "Goodbye Charlie" - all from stories by David Milch and Bill Clark.
Worth became a supervising producer for the ninth season in fall 2001 and wrote a further five episodes; "Two Clarks in a Bar", "Puppy Love", "Oh, Mama!
Worth joined the crew of HBO Western drama Deadwood as a writer and producer for the first season in 2004.
Worth and the writing staff were also nominated for a Writers Guild of America Award for Outstanding Drama Series at the February 2006 ceremony for their work on the second season.