Dorothy married Harry Joseph Letterman, David's father, in 1942. He passed away in 1973. She later married Hans P. Mengering, a retired structural engineer who died in March 2013. She retired from television
along with her son in 2015 — although David recently reemerged to induct the band Pearl Jam into the Rock and Roll Hall of Fame, along with discussing
the 2009 sex scandal that he described as "the lowest point of my life."