He made his film debut in Sidney Lumet’s The Group in 1966, and made his final film appearance in the 2015 Anthony Hopkins-led thriller Blackway.
(We chatted with Holbrook for the latter film in 2007.)
On film he gave his most iconic performance as Watergate scandal whistleblower Deep Throat (later revealed as Mark Felt) in the 1976 classic All the President’s Men opposite Robert Redford.