What Harry Potter movie did Dobby die in?

Professor Albus Percival Wulfric Brian Dumbledore dies in Harry Potter and the Half-Blood Prince, both the book and the movie. He's killed by Professor Severus Snape with the Avada Kedavra spell after Harry and Dumbledore had been to the cave where they found a Horcrux that turned out to be fake. In Harry Potter and the Deathly Hallows, it's revealed that the death was planned between the two of them.