Las Vegas Sun - Photograph : David Letterman Hosts

January 22, 2018

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Comedian Richard Pryor gesture while sharing a laugh with David Letterman during the "David Letterman Show" in New York Thursday, January 15, 1987. Pryor is starring in the film "Critical Condition."

Susan Ragan / AP

Comedian Richard Pryor gesture while sharing a laugh with David Letterman during the "David Letterman Show" in New York Thursday, January 15, 1987. Pryor is starring in the film "Critical Condition."