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New York Music Teacher Joseph Horner, 27, Charged With Murder of Sister-in-Law Victoria Castle After Alleged Decade-Long Obsession

7/5/2026

Joseph Horner, a 27-year-old music teacher in Nassau County, New York, has been charged with second-degree murder in the death of Victoria Castle, 25, a Stony Brook University Ph.D.

student and his sister-in-law, Nassau County police announced.

Prosecutors allege Horner harbored an obsession with Castle for more than a decade before allegedly luring, sexually assaulting, and strangling her on June 29 at a North Massapequa residence.

The Alleged Attack and Arrest Officers responded to a North Oak Street home at approximately 8:44 a.m. on June 29 after a 911 call reported a woman not breathing.

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