Investigators on Long Island are officially handling the death of fashion designer Martha Nolan-O'Slatarra as a homicide, multiple police sources have exclusively told Us Weekly. "It was a murder," stated one source emphatically. "As of right now, everyone's trying to build a case against [the suspect], but I couldn't say how close we are to an arrest." Nolan-O'Slatarra, 33, was found lifeless on August 5 on a boat that had been docked at a yacht club in Montauk.