I think your talking about "Locomotora" Castro vs. "Action" Jackson I...
Not only is it a great knock out, it's a great fight and is argueably the greatest comeback in boxing history. Up there with Moore-Durelle, JCC-Taylor, Reagan-Dempsey and Chacon-Limon IV.
John D. Jackson was out boxing and beating the crap out of Jorge Castro for 8 full rounds and most of the 9th and then it happened...
http://www.youtube.com/watch?v=5gNJsdRDQYw
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