Boxing heavyweight legend George Foreman has died aged 76, according to his family.

Known as Big George in the ring, the American built one of the most remarkable and enduring careers in the sport, winning Olympic gold in 1968 and claiming the world heavyweight title twice, 21 years apart - the second making him the oldest champion in history aged 45.

He lost his first title to Muhammad Ali in their famous Rumble in the Jungle fight in 1974. But Foreman's professional boxing career boasted an astonishing 76 total wins and 68 knock outs, almost double that of Ali.

He retired from the sport in 1997 before finding fame and fortune again as a pitchman for a best-selling grill named after him.

His family said in a post on Instagram on Friday night: "Our hearts are broken.

"A devout preacher, a devoted husband, a loving father, and a proud grand and great grandfather, he lived a life marked by unwavering faith, humility, and purpose."

The statement added: "A humanitarian, an Olympian, and two time heavyweight champion of the world, He was deeply respected - a force for good, a man of discipline, conviction, and a protector of his legacy, fighting tirelessly to preserve his good name - for his family."