Noooooooo...I mean it was going to happen someday, but nooooo...Noooooooo!
I mean, yes, 99 and a long career is everything you could ask for, but it's still sad. She was a giant in the voice industry, the equal of Mel Blanc, to say the least.
Mark is an unsung treasure himself.If anyone wants to learn more about June (or really anything regarding tv, animation, and comics in the 70s/80s) I have to recommend Mark Evanier at http://www.newsfromme.com/. He has a few really good stories related to her, but his blog unfortunately just gets overwhelmed with death notices about people in the industry, so you might have to scroll down a bit.