Dominick Anderson, 26, was arrested Dec. 19 after he allegedly killed his grandmother, Beverly Holmes, 62, in his family's apartment, the New York Daily News reported.
Police Wednesday revealed why Anderson allegedly killed his grandmother: He believed she was going to put a voodoo curse on him.
"I killed my grandmother with a cream-colored elephant tusk, and I did it because she was trying to have me killed," Anderson allegedly told police after he was arrested. "She started doing some voodoo [expletive], and that's when it triggered me off."
Anderson has been charged with first-degree murder, kidnapping and assault for the incident, during which his sister and police officers were also injured.
"There are clearly mental -- health aspects in play," said Sam Roberts, Anderson's court-appointed lawyer.
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