Sylvie Cachay Update: Nicholas Brooks convicted of murder in death of NYC swimsuit designer Sylvie Cachay / Personal Photo (CBS/AP) NEW YORK - The boyfriend of Sylvie Cachay, a New York City swimsuit designer found dead at an upscale hotel, has been convicted of murder. PICTURES: Sylvie Cachay: Fashion designer found dead in posh NYC hotel The verdict for Nicholas Brooks, 26, was issued on Thursday. The 33-year-old Cachay was found Dec. 9, 2010 in an overflowing hotel room bathtub at the SoHo house. The defendant's father was Joseph Brooks, an Oscar-winning composer who wrote "You Light up My Life." Prosecutors said Brooks used Cachay to fund his lavish lifestyle and marijuana habit and when she allegedly threatened to end their relationship, he killed her. His lawyer argued she took too many pills and drowned accidentally. Nicholas Brooks, left, and Sylvie Cachay / Terry Sheridan/Getty Images According to CBS New York, a medical examiner determined Cachay died from strangulation and drowning. Complete Coverage of Sylvie Cachay on Crimesider