Regis Philbin was never formally on the payroll of “The Late Show With David Letterman,” but he might as well have been. When Letterman retired in May 2015, Philbin, the TV veteran who died on July 24 at 88, emerged as the most frequent visitor to joke and spar with Letterman in the guest chair…

via David Letterman Says Regis Philbin Is ‘In the Same Category as Carson’ — Variety