His son tweeted: "Around a month ago my father was diagnosed with a severe case of pneumonia. He fought extremely hard and clinically was making progress. Unfortunately, on Monday night his heart had enough and it was his time."
For years he performed at the World Wrestling Entertainment (WWE).
The 1.93m (6.3ft) athlete was known for his physicality and aerial manoeuvres.
RIP @itsvadertime@ITSVADERTIME His career somewhat faded in recent years, although he continued making sporadic appearances in different promotions.
He also made appearances in TV shows Baywatch and Boy Meets World.
The WWE said it "is saddened to learn" that Leon White passed away.
WWE released a tweet stating: "WWE is saddened to learn that Leon White, better known to WWE audiences as Vader, passed away Monday night at the age of 63"
Vader's wrestling colleagues and fans also paid tributes to the wrestling legend.
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