Jeffrey DeMunn played Ken O'Neal in the episode An Khe. He is best known for his starring role on The Walking Dead. He has also had a starring roles on the program Mob City (with Gregory Itzin and Robert Knepper), recurring roles on the programs Billions, Law & Order and The Good Wife.

He has also starred in several motion pictures, including The Majestic (with Hal Holbrook, Allen Garfield, Bob Balaban, Daniel von Bargen, Earl Boen and Larry Cox), Burn After Reading (with David Rasche and J.K. Simmons), The Mist, Hollywoodland (with Erin Gooderham and Kevin Hare), Newsies (with Kevin Tighe), Ragtime, The Blob (with Beau Billingslea and Paul McCrane), The X-Files (with Mitch Pileggi, Terry O'Quinn and Armin Mueller-Stahl), The Green Mile (with James Cromwell and Rachel Singer), The Shawshank Redemption (with McCrane, David Proval, Alfonso Freeman, Ron Newell , Larry Brandenburg, Bill Bolender, Rohn Thomas and Don McManus), The Hitcher (with Armin Shimerman) Frances (with Pamela Gordon and the TV movie Citizen X for which he was nominated for an Emmy.

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