Griphook, Scabior, Gregory Goyle, Fred Weasley, Remus Lupin, Nymphadora Tonks, Severus Snape, Bellatrix Lestrange, and Lord Voldemort. (In the original novel, Vincent Crabbe and Colin Creevey also die, but Goyle does not and the fates of Griphook and Scabior aren't mentioned.)
More than three characters were killed, see related questions for a full list.
Harry Potter and the Deathly Hallows Part 2.
No, only the Horcrux inside him was.
harry killed voldemort
Bellatrix Lestrange.
he found the truth and killed voldemort
Voldemort killed Snape.
Yes, he does kill Lord Voldemort in the end of Deathly Hallows.
Many people are killed in the Deathly Hallows but after? That's the last book. Harry Potter and the Deathly Hallows. Unless your talking about the epilogue but that's still part of the book.
Draco Malfoy wasn't killed.
Yes, Bellatrix Lestrange dies in Harry Potter and the Deathly Hallows. She is killed by Molly Weasley during the Battle of Hogwarts, because Bellatrix attacked Ginny.
No. Although in my opinion, this is rather unfortunate.