Kevin Smith survives 'massive heart attack'

Filmmaker Kevin Smith has revealed he almost died of a

'massive heart attack'

after rushing to a hospital on Sunday night.

Smith, 47, shared the news on Twitter from is hospital bed in

California

.

"After the first show this evening, I had a massive heart attack. The Doctor who saved my life told me I had 100 per cent blockage of my LAD artery (aka 'the Widow-Maker').

"If I hadn't cancelled show 2 to go to the hospital, I would've died tonight. But for now, I'm still above ground!" he tweeted.