Professionals can punch hard, and both the speed at which the punch travels and the weight behind it can certainly cause extensive damage if aimed anywhere near the head. I, for one would not want to be on the receiving end of one such a punch. An example of a boxer who died a few weeks after being knocked out in a fight is Johnny Owen, the Matchstick Man from Merthyr Tydfil. He died in November 1980, after being knocked out by Lupe Pintor when fighting for the world bantamweight title in Los Angeles. This is just one example of ...