Molly Weasley killed her after Bellatrix was dueling Luna, Hermione, and Ginny together, and she shot a killing curse to Ginny but missed and aggravated by the death of Fred she doesn't want her ONLY daughter dead so she shot a curse that hit Bellatrix on the chest.
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Bellatrix throws the knife at Dobby's chest as he is apparating out of Malfoy Manor, but he dies on the beach near Shell Cottage (Bill and Fleur Weasley's house). Harry buries him by hand.
Dobby died in Harry Potter and the Deathly Hallows.
Arthur Weasley didn't kill anybody throughout the series. His wife, Molly Weasley, killed Bellatrix Lestrange.
Bellatrix Lestrange's maiden name is Black. If you are talking about who potrayed her in the movies, her name is Helena Bonham Carter.
A silver knife, thrown by Bellatrix.
It's Madame Lestrange. Meaning, Bellatrix Lestrange. With a courtesy title in front, her name would be Mrs. Lestrange, or Madame Lestrange.