Emma Thompson stated that she wouldn't have time to film the scenes due to work on Nanny McPhee, which meant her character would be cut. However, Thompson did have time to film some scenes so...
Professor McGonagall did not die. After Professor Dumbledore died, Professor Severus Snape became the new headmaster of Hogwarts. When Snape died, she takes his place as headmistress.
The Deathly Hallows are called the Deathly Hallows because of the three brothers. the three brothers made a bridge one day with there wands over a river that most people drowned in when Death came ....
He gets killed by Voldemort because Voldemort thinks that Snape is the rightful owner of the Elder Wand as he killed Dumbledore (the previous owner). To become the owner of the Elder Wand you have to...