Supernatural alum Mark Sheppard has announced on Instagram that he recently survived multiple heart attacks.

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"You're not going to believe this! Was on my way to an appointment yesterday when I collapsed in my kitchen. Six massive heart attacks later, and being brought back from dead 4 times I apparently had a 100% blockage in my LAD," Sheppard wrote on Instagram Saturday.

"The Widowmaker. If not for my wife, the @losangelesfiredepartment at mullholland and the incredible staff @providencecalifornia St Joseph's -- I wouldn't be writing this. My chances of survival were virtually nil. I feel great. Humbled once more. Home tomorrow! #spnfamily."

Sheppard, 59, is also known for his roles in Firefly, Battlestar Galactica and Leverage.