Long Island music teacher Joseph Horner is accused of meticulously planning the murder and s*xual assault of his 25-year-old sister-in-law, Victoria Castle. According to prosecutors, Horner even practiced applying a chokehold on a stuffed animal before carrying out the gruesome crime. According to prosecutors, Horner remained at the home after the attack and waited for responding officers at the front door. He was arrested by the Nassau County Police Department’s Homicide Unit while Castle was taken to St. Joseph’s Hospital, where she was pronounced dead. He’s currently being held at the Nassau County without bail.