David Letterman Announced He’s Retiring in 2015

Watch the Cast of ‘HIMYM’ Do Letterman’s Top 10 List

Watch Will Ferrell Sing with the Vienna Boys Choir on ‘Letterman’

Former ‘Letterman’ Writer Will Forte Returns to ‘Letterman’

David Letterman Extends His Contract Through 2015, Past NBC’s ‘Tonight Show’ Transition

Watch Steve Martin Make Fun of David Letterman for 15 Minutes

Watch Bill Murray’s Appearance on David Letterman’s 20th Anniversary Show

Here’s Bill Murray’s Liberace Entrance for Letterman’s 20th Anniversary Show

Amy Sedaris Was Great as Ever on ‘Letterman’ Last Night

Letterman’s First Guest, Bill Murray, Will Return for His Show’s 20th Anniversary This Week