A sad day for British boxing fans indeed. In tribute, here is Angelo Dundee's account of Cooper felling Cassius Clay:
Cassius was alternately taunting Cooper and toying with him, and I figured it was only a matter of time until referee Tommy Little mercifully put an end to this bloodbath. What i hadn't figured on, however, was what happened next. With a few seconds left in the 4th, Cooper, frustrated in his attempts to land his left and furious at Cassius for toying with him and humiliating him in front of his countrymen, backed Cassius into the ropes. There he led with a soft left jab, and Cassius instinctively moved away from the right cross that was sure to follow. Instead, Cooper uncorked "Enry's 'Ammer," his big left, catching Cassius flush on the jaw with a punch Cassius later said "Made me feel as if I had gone back and visited all my ancestors in Africa"