<p>People gather under the marquee of the Ed Sullivan Theater in New York, Wednesday.</p>
May 22, 2015
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May 22, 2015 9 p.m.
Letterman signs off as late-night host
Colbert to take over in September
NEW YORK - David Letterman ended his 33-year career as a late-night television host Wednesday, ushered into retirement by four presidents who declared "our long national nightmare is over" and saying there was nothing he could ever do to repay his audience.