Hokuto no Ken Episode 80
Kenshiro thinks about Yuda, another member of the Nanto Roku Seiken, who was the master of Nanto Koukaku Ken (South Star Crimson Crane Fist). He remembers how he fought against Rei, a man he was jealous of. Rei defeated him, but also died soon afterwards as his time was up. Kenshiro thinks that Rei's legend will never die.
In the manga...
-This episode is filler and does not happen in the manga.