We never really know specifically, only that it is a Death Eater.
Bellatrix kills him in Harry Potter and the Deathly Hallows
Yes and harry potter kills him
No. Harry Potter was hit by the killing curse in Harry Potter and the Deathly Hallows however, it only kills the part of Lord Voldemort's soul that was in Harry.
Molly Weasley kills Bellatrix Lestrange in a duel, when Bellatrix was attempting to finish of her daughter. This happens near the end of the Battle of Hogwarts, in Harry Potter and thhe Deathly Hallows.
the final battle between harry and voldemort where harry kills voldemort
I'm not sure I understand the question but Voldemort does not win and Harry Potter kills him.
There is an explosion and a wall falls on Him.
Harry potter kills Voldemort ( aka "you know who" or the dark lord or He Who Must Not Be Named
He did die, but he came back to life and kills voldamort.
One of the Death Eaters that was after Harry missed him and hit Hedwig. Not sure which one though.
harry kills voldemort!
Dobby died in Harry Potter and the Deathly Hallows.