This one hurts.  And it is very sudden.  TMZ:

Comedian Garry Shandling died at an L.A. area hospital on Thursday … TMZ has learned.

The 66-year-old star was not suffering from any illness … as far as we know … so, it appears this was sudden. A source connected to Shandling says he was healthy and speaking to people on Thursday morning.

Yeah, I saw this tweet recently too

So @GarryShandling & I had to call Saul @mrBobOdenkirk pic.twitter.com/DcLhvfvaJZ

— Kathy Griffin (@kathygriffin) March 21, 2016

UPDATE: This was a nice tribute