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The ministry still does not believe Harry, but at the end of Harry Potter and the Order of the Phoenix, Voldemort is confirmed 'returned' and the killing curse, is used. Bellatrix Lestrange is in a deadly and very violent duel with Harry Potter's godfather, Sirius Black. Sirius laughs when Bellatrix misses him the first time, but she succeeds on her next attempt to kill her cousin, using the Avada Kedavra curse and killing Sirius Black.
Half Blood Prince Edit
Just once in Harry Potter and the Half Blood Prince is the killing curse used. This is performed by Severus Snape, high up in the clock tower, accompanied by Draco Malfoy, Bellatrix Lestrange, and several other Death Eaters. Harry Potter is also at the scene, but hiding underneath watching. Snape steps towards Dumbledore after arriving late, and says slowly, but just as painfully, A-v-a-d-a K-e-d-a-v-r-a!
Avada Kedavra is a curse that can be a range of a few different colours, including blue, green, and somewhere in the middle. Sometimes, it depends on the wand casting the curse as to what colour it is. For example, Wormtail and Voldemort produce a green curse, although Snape's is slightly bluer. The killing curse is a form of spell that shoots out of the wand very quickly, and gives the opponent not much time to block it. The cast can go off in many directions, shooting up and around the main jet, making it look like a flash of green or blue light.
Mastering Avada Kedavra is a very hard job. The killing curse is one of the hardest of all spells to learn and can only be perfected by very powerful witches and wizards. There is no particular way to say the curse, although you must cast it in a particular way. First, you must hold your wand slightly-not far- into the air. Then you must slowly lower your wand and say the incantation clearly. If you move the wand too fast when casting the Avada Kedavra curse, there could be some major side-effects.