Star Wars Episode III: Revenge of the Sith
Vader travels to Mustafar, where he assassinates the Separatist leaders. While he does this, Palpatine makes a speech to the Galactic Senate where he announces the Republic and Separatists will unite into the Galactic Empire. Obi-Wan and Padmé find Anakin on Mustafar. Obi-Wan and Anakin fight each other and Obi-Wan cuts off Anakin's limbs. Obi-Wan leaves Anakin scarred and burnt by the lava river and assumes Anakin has died.