Jim "The Anvil" Neidhart, an icon of professional wrestling has passed away at the age of 63.

Uproxx.com reports Neidhart, founding member of The Hart Foundation and father to current WWE Superstar Natalya, passed away on Monday morning at the age of 63.

No details have been released so far on the cause of death.

From uproxx.com -

Neidhart became a pro wrestler in 1979 after setting the California high school record in shot put — where he earned the ‘Anvil’ nickname — and playing preseason NFL games with the Oakland Raiders and Dallas Cowboys. Trained by the legendary Stu Hart, Anvil competed in Calgary Stampede and even New Japan Pro Wrestling in the early ’80s before joining the World Wrestling Federation in 1985.