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At the end of Harry Potter and the Deathly Hallows on the 2nd May 1998 during the final battle. Lord Voldemort cast the killing curse at Harry using the elder wand, which Harry was technically the master of. The wand cannot be used against it's owner and so, the wand flew out of Voldemort's hand and Harry cast expelliarmus resulting in the spell hitting a now defenceless Voldemort.
Page 736 and 737 of Harry Potter and the Deathly Hallows.
During the second part of the movie: Harry Potter and the Deathly Hallows, Professor Flitwick, Professor McGonagall, Molly Weasley and Professor Slughorn cast the following protective enchantments around the castle in the "Battle of Hogwarts":"Protego Maxima.Fianto Duri.Repello Inimicumand Protego Horribilis (in the book)."Hoping to delay Voldemort, and buy Harry, Hermione and Ron time to find and destroy Voldemort's remaining Horcruxes hidden deep within the castle.
If you're talking about Jamie Waylett who plays Crabbe, he was arrested for drug possesion earlier this summer and will not be in Deathly Hallows. He's supposed to die but it has been reported that Goyle will be killed instead.
Harry Potter has used two unforgivable curses. In the Order of the Phoenix he used the Cruciatus curse on Bellatrix Lestrange, then in the Deathly Hallows he used the Imperius curse to break into Gringotts.