Stars are mourning the loss of Garry Shandling on social media.

The actor and comedian suddenly died on Thursday, March 24, in LA from unknown causes, though new reports suggest he suffered a heart attack. He was 66-years-old.

RELATED: Beatles Producer George Martin Has Died at Age 90

Since the news of his death, those he inspired — like Jimmy Kimmel and Kathy Griffith — have taken to Twitter to share photos and kind words about the TV star.

Scroll down to see just some of the many touching tributes: