Sha Koon was a Kel Dor female Jedi Knight and the niece of Jedi Master Plo Koon. Her uncle, who shared a telepathic bond with her, brought Koon from her homeworld of Dorin to the Jedi Temple on Coruscant to begin her initial training under Jedi Grand Master Yoda. Koon eventually became the Padawan of Ithorian Master Saldith. In 44 BBY, she was involved in the Stark Hyperspace War between the Galactic Republic and the Stark Commercial Combine and assisted her uncle and the Jedi High Council in bringing an end to the conflict. After rising to the rank of Jedi Knight, Koon took the Jedi Baylis Archan as her Padawan. In 19 BBY, the final year of the Clone Wars, Koon fought alongside Jedi Knight Halagad Ventor and a detachment of Republic clone troopers in a battle on the planet Bal’demnic. Later that year, Koon, Archan, and a command of troopers fought against the Separatists in a battle on Giju. During that engagement, Koon’s soldiers were killed, along with her Padawan. After the battle, Koon returned to the Jedi Temple and refused to resume fighting in the war.

Shortly after the Sith Lord Dooku’s death during the Battle of Coruscant, Koon was tasked by her uncle to search the Jedi Archives for any information regarding the mysterious Sith Lord that Dooku had mentioned to be in control of the Galactic Senate. While at the Archives, Koon was targeted as part of the initial stages of Order 66, which was Supreme Chancellor Palpatine’s order to the Republic’s clone troopers to eliminate their Jedi Generals. She escaped the attack on the Jedi Temple, which was led by the Dark Lord of the Sith Darth Vader. Weeks after Palpatine declared himself Emperor of the Galactic Empire, Koon lured Darth Vader into a trap in the Jedi Temple’s underlevels. In the ensuing duel, Koon was able to injure Vader but was mortally wounded by the Sith Lord. Before she died, Koon experienced a vision of Vader’s redemption, Palpatine’s death, and the return of the Jedi Order through Vader’s children, Luke Skywalker and Leia Organa.