Donald O'Connor guested on The Nanny in episode #4.5 -
"Frieda Needa Man."
This episode appeared in the fourth season and aired on
October 16, 1996.
Donald O'Connor plays Aunt Frieda's shy, wealthy boyfriend who inadvertantly collapses from a heart attack right on Fran during a dance lesson in her bedroom. He manages to recuperate and after some misgivings, marries Frieda before promptly passing away.
'Singing in the Rain' is one of my favorite movies. So I enjoyed seeing Donald O'Connor guesting on The Nanny. And I loved how he totally outdanced Fran, without her knowledge.