David Letterman calls it a day

The longest-running late night chat show host in American TV history is calling it a day. David Letterman has been in the time-slot for 31 years. He spent most of his time on the 'Late Show' which is produced by his oddly named company "Worldwide Pants". AUDIO: Here's how he announced the news to his studio audience - after making a call to the boss of network CBS. Click the PLAY button above to listen.

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