Great Jedi Purge
Shaak Ti during the Great Jedi Purge dueling the Secret Apprentice.Shaak Ti was selected to safeguard the Jedi Temple while Mace Windu took a group of Jedi Masters to arrest the Supreme Chancellor. Although she possessed considerable fighting prowess, Shaak Ti was chosen to stay at the Jedi Temple to organize the Jedi Temple's defenses. Moments before the Great Jedi Purge, Ti encountered Anakin Skywalker, whom she believed was on his way to the Chancellor's office to help Mace Windu, Kit Fisto, Agen Kolar, and Saesee Tiin in the arrest. She tried to stop him from leaving, but the young Knight was persistent, saying he was the Chosen One, and it was his duty to be present.
As the Jedi Temple's commander and defender[1], Shaak Ti was present during the fall of the Jedi Temple, during which Darth Vader himself set out to kill the Jedi Master. Shaak Ti as the Temple's finest swordsmaster was still no match for Anakin and the stormtroopers of the 501st legion [7]. She managed to avoid Vader and the 501st, and went into self-imposed exile on Felucia, where fellow Jedi Aayla Secura was shot down. Some time later she met Jedi Maris Brood, who was bent on revenge against Vader. Shaak Ti convinced her to go into hiding on the planet Felucia, where she was training the Force sensitive natives for an eventual conflict with Vader and his secret apprentice.
She, Obi-Wan, Anakin, and Yoda were the last 4 known surviving members of the Jedi Council.