Actress Sandra Oh cursed CBS and Paramount networks over Stephen Colbert's show cancellation, citing concerns about culture and free speech during her guest appearance.

David Letterman delivered a fiery rant against CBS and parent company Paramount for cancelling Stephen Colbert’s “Late Show,” calling the decision “gutless” and “pure cowardice” as he labeled his successor a martyr of the network.

The cost of producing late night programs has risen as the media industry has been upended by streaming and shifting consumer habits.