NEW YORK (Reuters) – A Long Island architect was charged by a New York prosecutor on Tuesday with the murder of a fourth woman, six months after he was named as the prime suspect upon his arrest in the killings of three other women whose bodies were left near a beach. Rex Heuermann, 59, was formally charged with the murder of Maureen Brainard-Barnes, a 25-year-old Connecticut mother of two children who went missing in 2007, Suffolk County District Attorney Raymond Tierney said at a press conference. Heuermann was arrested in July and pleaded not guilty to the murders of Melissa Barthelemy, Meg…