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LI music teacher accused of strangling sister-in-law to death: authorities

Prosecutors say Joseph Horner attacked Victoria Castle after asking for help moving a piano and now faces second-degree murder charges.

  • On Monday, Joseph Horner, a music teacher for the Oceanside School District, allegedly strangled his sister-in-law, Victoria Castle, to death in their Massapequa home; Horner pleaded not guilty to second-degree murder on Tuesday.
  • Prosecutors allege Horner asked Castle for help moving a piano before attacking her from behind, placing her in a chokehold "until her body went limp," then changing his clothes and calling 911.
  • Defense attorney Gregory Grizopoulos described Horner as "loved by his students and his colleagues," stating the allegations contradict community beliefs, while police noted additional charges could be filed.
  • A judge ordered Horner remanded without bail Tuesday, issuing an order of protection for his wife, who was at a bachelorette party during the attack; the Oceanside School District placed him on administrative leave.
  • Officials with Stony Brook University, where Castle was a PhD student, stated they were "deeply saddened by the loss of Victoria Castle," committing to support the grieving community of classmates and faculty.
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abc 13 Houstonabc 13 Houston
+3 Reposted by 3 other sources
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New York elementary school music teacher charged in disturbing murder of sister-in-law

An elementary school music teacher allegedly strangled his sister-in-law to death in a home where they had separate apartments.

·Houston, United States
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Newsday broke the news in United States on Tuesday, June 30, 2026.
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