What happened to Rebecca Zahau is still a mystery to many. The 32-year-old's case is being revisited in a limited series on the Oxygen Network called "Death at the Mansion." Zahau had been dating Jonah Shacknai, a wealthy business man. In July 2011 she was home with Shacknai's son Max, 6. Police said the boy fell over a banister and died of his injuries. Police were called to the house again two days later to investigate Zahau's death. InsideEdition.com's Mara Montalbano has more.