Most recently, the Megan Boone character (Elizabeth Keen) in one of my favorite tv series "The Black List". I was shocked by her passing!!!
Coach (Nicholas Colasanto) from Cheers; and Barney from the Andy Griffith Show. Seriously.
Real-life models
The character of Adam Schiff is loosely based upon long-serving New York County, Manhattan District Attorney Robert Morgenthau.
Personally, I did not find his acting to be believable in Law and order as well as Mission Impossible. I found Peter Graves did a better job.
When Phil Hartman died, he checked out of two series : NewsRadio, and The Simpsons.
In NewsRadio , they replaced his character with Jon Lovitz, but in The Simpsons, his characters, like actor Troy McClure and the lawyer Lionel Hutz, just...stopped appearing.
Good one Splotch. I loved those Simpson characters....I remember Troy McClure from Today We Kill and Tomorrow We Die and Gladys the Groovy Mule. Here are a few other Troy McClure movies:
http://simpsons.wikia.com/wiki/List_of_Troy_McClure_Films
Mission Impossible. I found Peter Graves did a better job.
Rollin Hand
Cinnamon Carter -Barbara Bain
It really change the Dynamic of the series when they left
Cheers
Booker