Step 1 : Introduction to the question "According to Star Wars legend, who killed Jango Fett?"
...Jango Fett was widely known as the best human male bounty hunter in the Star Wars galaxy. His greatest desire in life was the creation of an unaltered clone whom he could raise as his own "son." The Kaminoans granted that request, creating Fett's clone, Boba Fett. When the Separatist Droid Army met a Jedi assault team in the Petranaki arena, Jango Fett met Jedi Master Mace Windu in the ensuing battle. The two men fought furiously, with Fett killed by decapitation in the end. Fett's son, Boba Fett, vowed revenge on the Jedi who killed his father. Source: StarWars.Fandom.com
