text: In 2014, Letterman announced his retirement and the final episode of Late Show aired on May 20, 2015. After Letterman's final Late Show, instead of airing reruns of the show or having guest host episodes of Late Show, CBS opted to air reruns of scripted dramas in the 11:35 pm time slot over the summer with the branding CBS Summer Showcase. The show was then succeeded by The Late Show with Stephen Colbert, hosted by Stephen Colbert, which premiered on September 8, 2015.
  History
  CBS had previously attempted late-night talk shows with The Merv Griffin Show (1969–1972) and The Pat Sajak Show (1989–1990), but Griffin clashed with network censors and moved to syndication while Sajak was unable to compete with NBC's The Tonight Show Starring Johnny Carson and was canceled due to poor ratings. For most of the 20 years preceding Late Show, CBS's late night fare consisted of movies, reruns and specialty programming packaged under the name
  CBS Late Night and broadcast to middling ratings. When David Letterman became available following a conflict with NBC, CBS was eager to lure him and offered him a three-year, $14 million per year contract, doubling his Late Night salary. According to their agreement, the show would spend a month in Hollywood at least once a year.
  CBS purchased the Ed Sullivan Theater for $4 million, spending "several million" to renovate it. The renovation was supervised by architect James Polshek. CBS' total cost for acquiring the show including renovations, negotiation rights paid to NBC, signing Letterman, announcer Bill Wendell, Shaffer, the writers and the band was over $140 million.