In disturbing new developments in a case of a Long Island music teacher charged with killing his sister-in-law, prosecutors claim to have evidence the suspect practiced a chokehold on a stuffed animal minutes before the deadly crime. Joseph Horner was in court Wednesday as he faces charges of raping and murdering his sister-in-law whom he had lusted after for years. "He's a cold, calculated, vicious killer," said Nassau County District Attorney Anne Donnelly. Prosecutors described the chilling June attack. The 27-year-old Horner allegedly choked 25-year-old Victoria Castle, who lived in a downstairs apartment in the same Massapequa house on North Oak Street he shared with his wife. #longisland #nassau #ny #crime