On 13 November 1982, reigning WBA lightweight world champion, Ray 'Boom Boom' Mancini was due to defend his title against challenger, the South Korean Kim Deuk-koo.

In Mancini's words it was going to be an "action fight" in front of a 15,000-strong crowd at Las Vegas's fabled Caesar's Palace venue. Millions more were tuning in at home on TV.

It was a fight that Mancini went on to win but his opponent suffered fatal injuries that would cause great controversy and change the sport.

Thirty-one years on from that fateful night, Ray Mancini talks about the fight.

Witness is a World Service radio programme of the stories of our times told by the people who were there.

Directed by Claire Tailyour