He was aiming for a death eater but missed and hit George instead.
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No, he was injured by a curse and lost his ear. It was his twin brother Fred who was killed.
In the book, Snape uses a non-verbal spell, so we don't know which spell he used, In the movie, the spell Snape uses is "Vipera Evanasca".
Albus Percival Wulfric Brian Dumbledore dies in Harry Potter and the Half Blood Prince, the sixth book in the series, after being murdered by Professor Severus Snape on the highest Astronomy Tower.
Sectumsempra is a Dark Arts curse invented by Severus Snape (under his alias of "The Half-Blood Prince") for the use against his enemies, and it soon became one of his specialities. When uttered, its effect is the equivalent of an invisible sword, slashing the target repeatedly. The injuries appear to follow the movements of the caster's wand, and thus inflicts the most damage if cast with rapid waving movements. It works best on living targets and has no noticeable effect on inanimate objects or dead ones, such as Inferi, other than slashing them pointlessly. Sometimes the slashing cuts are continual, or it could be one cut.
AnswerThe exact curse was never specified, but it was caused by him wearing a cursed ring.AnswerAvada Kedavra, cast by Severus Snape. But he was already poisoned and cursed, so he would have died soon anyway.