Vader can only listen as he lays wounded,to his master as he tries to manipulate Luke's emotions to end his father's life, but Luke doesn't give in to the dark side. Luke deactivates his lightsaber and throws it away, passing Yoda's final test and proudly declaring his allegiance to the Jedi. When the Emperor realizes Luke will not turn to the dark side, he uses force lightning to end his life. Luke calls out to his father for help. In an act of self-sacrifice, Vader grabs the Emperor and throws him to his death down the Death Star's reactor shaft. Anakin dies moments later, assuring his son that there is still good in him after all.
Related Star Wars Deaths
Episode IV - Han Solo vs Greedo
Episode II - The Demise of Jango Fett
Episode I - The Fall of Darth Maul
Episode III - Order 66