Garry Shandling Dead at 66

3/24/2016 12:48 PM PDT



1:44 PM PT -- Sources familiar with the situation tell TMZ Shandling died from a massive heart attack, with no prior warning whatsoever.

update_grey_gray_barComedian 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.

Our source says there was a 911 call from "The Larry Sanders Show" star's home, and he was transported to the hospital. We're told Shandling was alive when he arrived at the hospital.

0324-garry-shandling-twitter-01Last weekend, Shandling was hanging with friends Kathy Griffin and Bob Odenkirk ... who also co-starred with Garry on 'Larry Sanders.' 

Story developing ...