On May 20, 2015 he finished 33 years of performing on late night TV.
He celebrated his 70th birthday last week (April 12, 2017) and also eulogized his mom who passed away the day before.
When he was young his mother, who is of German descent, worked as a church secretary for the Second Presbyterian Church of Indianapolis.
Letterman is not a particularly religious man. He was married in March 2009 in a civil courthouse ceremony in Choteau, Montana.
In August 2011, Letterman was threatened by Islamic extremists on a jihadist website for a joke that he made on his show. One frequent contributor to the website referred to him as a "lowly Jew." Letterman is not a Jew, and he is not lowly.
In June 2009, Sarah Palin was offended by Letterman's jokes about her visit to New York City. The ensuing feud helped raise Letterman's viewership numbers.
The Times reported that, "David Letterman said on his show in October 2009 that he had been the victim of an extortion attempt over charges of sexual affairs with staff members, claims that he conceded were true." [8/2011]
There was one noteworthy Jewish related item in the scandal. Gawker reported that, "The scuttlebutt on the set had it that current assistant-in-question, Stephanie Birkitt, received extra compensation for duties as his First Assistant, in the form of Letterman picking up the tab for her graduate law studies at the Yeshiva University Law School."
Robert Halderman, the man who plead guilty to trying to extort $2 million from Letterman, as far as we can tell, is not Jewish.