Ben Kenobi: There's nothing you could have done, Luke... had you been there. You'd have been killed, too... and the droids would now be in the hands of the Empire.
Luke Skywalker: I want to come with you to Alderaan. There's nothing for me here now. I want to learn the ways of the Force... and become a Jedi like my father.
Luke Skywalker: How did my father die?
Ben Kenobi: A young Jedi named Darth Vader... who was a pupil of mine until he turned to evil... helped the Empire hunt down and destroy the Jedi knights. He betrayed and murdered your father. Now the Jedi are all but extinct. Vader was seduced by the dark side of the Force.