Aslan

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Each of the clues is referring to a specific pop culture character, and includes exactly one numeral.

Character Numeral
Jack4
Snow White7
Malcolm Crowe6
Goldilocks3
Sauron1
Darth Vader1
Gru3
Morpheus1
Zaphod Beeblebrox7
Gretl von Trapp5
Petruchio2
Katniss Everdeen12
Harold4
Dorothy3
Homer Simpson4

Indexing into each character by the numeral gives the clue KILLS DUMBLEDORE. The character who kills Dumbledore is SNAPE, which is the answer.