Music Teacher Charged With Murdering Sister-in-Law During Piano Move

A Long Island music teacher faces murder and rape charges after allegedly killing his 25-year-old sister-in-law while his wife was away on a bachelorette trip. Police suspect Joseph Horner, 27, of brutally strangling Victoria Castle, 25, inside their shared home in North Massapequa, New York. Prosecutors state Horner harbored a deep fixation on Castle for nearly ten years before striking on June 29. The two resided in separate apartments within a multi-family house, with Horner occupying the upstairs unit and Castle living downstairs. He reportedly waited for his wife to leave town before luring the doctoral student upstairs under the guise of helping move a piano. Castle complied with the request, believing she was performing a simple household chore. Investigators allege Horner then ambushed her from behind, applied a chokehold until she lost consciousness, and sexually assaulted her unconscious body. Court documents describe the attack as the culmination of years of alleged obsession rather than a random act of violence. Horner reportedly changed his clothes and called 911 himself to request police and medical assistance for the deceased woman. Deputy commanding officer Daniel Steller confirmed the caller specifically requested an ambulance for a female victim at that location. Emergency responders arrived to perform CPR before transporting Castle to a nearby hospital, where she was pronounced dead. Horner was taken into custody immediately at the scene of the crime. During questioning, prosecutors claim he admitted to having long-held erotic feelings for his sister-in-law and acting deliberately while his family was apart. This case highlights the severe risks posed by individuals who manipulate trusted relationships to commit heinous crimes. The community must remain vigilant against predators who groom targets over extended periods before executing violent attacks. Families in close proximity may feel vulnerable when a trusted neighbor or relative turns deadly during their absence. Authorities urge residents to report any suspicious behavior or history of obsession toward potential victims. The legal system will now determine if the death penalty or life imprisonment without parole is appropriate for Horner.

Joseph Horner faces second-degree murder charges without having entered a guilty plea to the deadly assault. His defense team vehemently disputes the allegations, insisting they contradict his beloved character and maintain his complete innocence. At the time of the attack, Horner's wife and the victim, Victoria Castle, were away on a bachelorette trip. Castle had previously asked Horner to help move a piano to his upstairs apartment, and he obliged willingly with no idea of the tragic events that would follow. Officials now suspect Horner changed clothes before calling emergency services in a calculated ploy for assistance, later admitting to detectives that he committed the act. A resurfaced Instagram post reveals the Long Island doctoral student was once described as gushing over her brother-in-law on the day he married her sister. Victoria Castle's message read, 'My sister, my person, my partner in chaos, is now married to one of the most wonderful people in the world.' Her attorney, Gregory Grizopoulos, noted that Horner is an Oceanside teacher who is tenured and deeply loved by his students and colleagues. He argued these allegations are not in line with what his community friends and family believe. The courtroom scene was emotional as Castle's family cried and hugged one another while Horner's family also remained present. Neither side wished to comment further on the serious allegations during the proceedings. The case has sent shockwaves through both the education community and academia alike. Horner worked as an elementary school music teacher in the Oceanside School District and has since been placed on administrative leave pending the outcome of the criminal proceedings. Castle was remembered by Stony Brook University as a promising young scientist pursuing her doctorate in geosciences. Colleagues described her as dedicated, bright, and deeply committed to her research. The tragedy has also drawn attention to a haunting social media post Castle wrote years earlier and shared on the day of the wedding. In it, she praised him as 'one of the most wonderful people in the world' and wished the couple happiness before the devastating revelation. As the investigation continues, prosecutors say forensic analysis and further interviews are ongoing to build a full timeline of events inside the home. Horner remains held without bail while awaiting trial. If convicted, he faces a sentence ranging from twenty-five years to life in prison. The Daily Mail has reached out to the NYPD and Allison Horner for comment regarding these developments.