David Letterman is subtly showing support for his successor Stephen Colbert after CBS' shock cancellation of "The Late Show."

Unlike Stephen Colbert’s late-night TV contemporaries, four of whom—Jon Stewart, John Oliver, Seth Meyers, and Jimmy Fallon—showed up on his The Late Show on Monday night, David Letterman hasn’t made an official statement about the late-night series he originated back in 1993’s shocking cancellation.