• "Draco, do it or stand aside so one of us-" screeched the woman, but at that precise moment, the door to the ramparts burst open once more and there stood Snape, his wand clutched in his hand as his black eyes swept the scene, from Dumbledore slumped against the wall, to the four Death Eaters, including the enraged werewolf, and Malfoy.
    "We've got a problem, Snape," said the lumpy Amycus, whose eyes and wand were fixed alike upon Dumbledore, "the boy doesn't seem able-"
    But someone else has spoken Snapes name, quite softly.
    "Severus..."
    The sound frightened Harry beyond anything he had experienced all evening. For the first time, Dumbledore was pleading.
    Snape said nothing, but walked foreward and pushed Malfoy roughly out of the way. The three Death Eaters fell back without a word. Even the werewolf seemed cowed.
    Snape gazed for a moment at Dumbledore, and there was revulsion and hatred etched in the harsh lines of his face.
    "Severus...please..."
    Snape raised his wand and pointed it directly at Dumbledore.
    "Avada Kedavra!"
    A jet of green light shot from the end of Snape's wand and hit Dumbledore squarely in the chest. Harry's scream of horror never left his; silent and unmoving, he was forced to watch as Dumbledore as blasted into the air. For a split second, he seemed to hang suspended beneath the shining skull, and then he fell slowly backward, like a great rag doll, over the battlements and out of sight.

    -Harry Potter and the Half-Blood Prince, chapter 27


    *Note: Again, I give full ownership rights to J.K.Rowling. I DID NOT write any of the above, and I give all credit to J.K.Rowling.