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Sir Michael Parkinson has paid tribute to Muhammad Ali, who has died aged 74.

Ali appeared on Michael Parkinson's chat show four times and remembers him as boxing's biggest ever star.

Parkinson said Ali was the most 鈥渆xtraordinary, explosive, dynamic person. Those first interviews I did with him defined what I did on the 大象传媒鈥�.

He said 鈥渢he ultimate irony of Ali was that he was the greatest fighter there鈥檚 ever been [鈥�] to then be affected by a tragedy caused by the sport he loved.鈥�

This clip is from 5 live Breakfast, Saturday 4 June 2016.