Leading to the conviction of Robert Durst for the 2000 murder of Susan Berman, two of Durst's siblings testified against him in court. Per Crime Story, Thomas Durst was in declining health when he took the stand, testifying to his brother's apparent anger issues and the controlling nature of the relationship Robert Durst had with his wife, claiming that he feared Robert would kill him on a few occasions. Although Douglas Durst (pictured above) never saw any violence or anger directed at Kathie Durst from his brother, he also feared for his life at the hands of his older sibling, according to Los Angeles Daily News.
Per Douglas Durst's testimony, Robert Durst claims to have witnessed the unusual death of their own mother, which he doubts, and that Kathie McCormack confided in him that Robert Durst was stealing from the family business. Wendy Durst Kreeger, the rare Durst sibling to not work for the organization, stayed somewhat more loyal to her troubled brother, Robert, although she seemingly believed him to be insane, per The New York Post. Reportedly, she stayed in contact and remained a confidant of Robert. However, she denies this, and she did not testify against him, according to The Guardian.
