Carl Froch retires: Hear the punch that floored George Groves

Listen to BBC Radio Nottingham's Colin Fray describe the right hook that saw Carl Froch beat George Groves to retain his IBF and WBA super-middleweight titles in front of a British-record 80,000 fans at Wembley Stadium in May 2014.

Nottingham boxer Froch announced his retirement on Tuesday and the punch that floored Groves turned out to be his last act as a professional.