Former Australian Ninja Warrior star Paul Lyons has died at the age of 50.

The double Olympian, who represented Australia in taekwondo at the 1992 and 2000 Olympics and later competed on season two of Ninja Warrior in 2018, reportedly passed away “suddenly but peacefully” on Sunday morning, according to Fighting Lyons, the family business where Paul was head coach.

“It is with the heaviest of hearts that we pass on this news to our patrons,” a spokesperson wrote on Instagram.

“This morning, beloved head coach Paul Lyons passed away suddenly but peacefully in his sleep. We are still in shock.

“Fighting Lyons will be closed for the next few days while our family processes and grieves this terrible loss.”

Paul’s wife and friends have paid tribute to the 50-year-old by setting up a fundraising page.

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“Paul provided both life and health coaching for individuals and teams looking to improve their skills, fitness and achieving success in their individual pursuits,” the message reads.

“He has influenced so many people’s lives, young and old. Paul was an inspiration and role model to so many. R.I.P Paul.”

Paul was 48 when he participated in the channel nine reality program.

He had over 40 years experience in taekwondo, acrobatics, boxing and personal training.