The family of Sarai Sierra is stricken with grief after the 33-year-old mother of two was found dead in Istanbul, Turkey. Sierra, an avid photographer, was vacationing alone in the city and was reporting on Jan. 21, the day she was supposed to fly home. Police believe robbery may have been the reason behind her death but the investigation is not conclusive. Turkish police say they are holding a number of people for questioning at this time.