Because Molly Weasley does it.
Not known.
Ginny didn't kill Bellatrix, Molly did. Bellatrix was killed in the Great Hall, although this may change in the movie.
No. Bellatrix Lestrange hated Harry Potter and wanted to kill him.
yes
She did not.
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There was a battle right there and then, and they were fighting with each other.Bellatrix had tried to kill Ginny.
She didn't want anymore of her kids dead.And revenge as Bellatrix just sent a killing curse at Ginny and it JUST missed her.
No. Bellatrix Lestrange and Hermione Granger are not related. Bellatrix is a pure-blood with no children and Hermione is muggle-born. Both her parents are muggle dentists.
because shes bellatrix lestrange and she works for voldemort and is evil.
She used the unforgivable curse Avada Kadavra which is the killing curse.
Arthur Weasley didn't kill anybody throughout the series. His wife, Molly Weasley, killed Bellatrix Lestrange.