It was the result of a spell. However, since this didn't occur in the book it is not known what spell was used.
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It's Madame Lestrange. Meaning, Bellatrix Lestrange. With a courtesy title in front, her name would be Mrs. Lestrange, or Madame 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.
Sirius Black was murdered by his cousin, Bellatrix Lestrange, because she is the crazy, murderous type. He wasn't on Voldemort's side and Bellatrix was one of Voldemort's loyal servants.
Bellatrix Lestrange was played by Helena Bonham Carter.
Bellatrix tortured Neville. Severus Snape, his fellow Death-Eaters Amycus and Alecto Carrow, and some wanna-be-Death-Eater Slytherins like Crabbe and Goyle.