KEY POINTS:
American Parry O'Brien, who revolutionised shot putting with his spinning technique and went on to break 17 world records and win three Olympic medals, died competing at a swimming event. He was 75.
He won 17 American titles in the shot put and one in the discus. Before he began experimenting with the "O'Brien Glide" in 1951, his top throw was 16.75m. By 1966 it was 19.28m.
