Muhammad Ali has sadly passed away at the age of 74.
The boxing legend, who was suffering from a respiratory illness complicated by a length battle with Parkinson's disease, died in a hospital in Arizona on Friday.
Tributes have poured in for the three-time heavyweight champion as the world mourns the loss of a sporting great, social activist and global humanitarian.
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Boxing great Floyd Mayweather wrote on Instagram: "Not a day went by entering the gym that I didn't think of you. Your charisma, your charm and above all, your class are all of the elements that will be greatly missed by myself and the world."
"Muhammad Ali shook up the world. And the world is better for it," President of the United States Barack Obama and First Lady Michelle Obama said in a statement.
YouTube hits of the boxer's greatest fights and famous quotes have soared, and another video to catch the attention is one of Ali proving himself to be one of the most inspirational figures in the planet.
In 1981, a 21-year-old threatened to commit suicide from a ninth-floor window ledge.
Police had reportedly tried to persuade the man not to jump for hours when Ali heard of the news. He arrived on the scene in a desperate attempt to save the man.
"You're my brother. I love you and I wouldn't lie to you," Ali, dressed in suit and tie, said from a nearby ledge. "You got to listen. I want you to come home with me, meet some friends of mine."
The man recognised Ali and, after 20 minutes, agreed to come inside.
Ali saves a man from committing suicide
In their coverage, CBS Evening News presenter Walter Cronkite called Ali a "superhero".
Truer words have never been spoken.