When Linda Walker Zevallos briefly dated real estate scion Robert Durst in 2000, she had no idea that he was a suspect in the 1982 disappearance of his wife, Kathie Durst. Today, the Dallas-based real estate agent knows that Durst, 71, the focus of HBO's recent documentary series, The Jinx, was arrested on March 14 and charged with the murder of his friend, Susan Berman - and that he was acquitted in 2003 of the murder of his neighbor Morris Black, whom he admitted to dismembering.