Ex-WWE superstar Vader has died ... after a two-year battle with congestive heart failure. He was 63.
Vader's son broke the news on social media, saying, "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."
Vader had undergone open-heart surgery back in March and seemed to be doing well -- but his health took a turn for the worse and he wasn't able to recover.
Before his wrestling career, Vader -- real name Leon White -- was a football star at the University of Colorado where he was a 2-time All-American offensive lineman.
He was drafted by the Rams in the 3rd round of the 1978 NFL Draft and played in Super Bowl XIV against the Pittsburgh Steelers.
He also made TV appearances on shows like "Baywatch" and "Boy Meets World."