Celebrity Trios

I posted the search for "The Rule of Threes" because I was looking to see if there was any reference to the game Jean and I play. We note whenever a well-regarded celebrity dies, and watch the news to see which two other celebrities follow them into the great beyond. Since people are dying all the time, you can stretch this to fit in any situation. But the variation is to try to name broad categories of expertise, i.e. an actor, a politician, a writer.

This month's trio starts with a musician/comedian and an actor:

• Victor Borge, dead at 91.
  
• Jason Robards dies at 78.
  

Your turn, what category will contribute number three?

[and since my wife was wondering, yes, Red Skelton is dead, died September 17, 1997]