Robert Durst

Robert Durst

| Credit: ETIENNE LAURENT/EPA/Shutterstock

Sareb Kaufman, the stepson of Susan Berman, had a request for Robert Durst at the real estate scion sentencing on Thursday for murdering his stepmother: Kaufman believes Durst also killed his first wife, Kathie, and buried her body. He pleaded with Durst to tell Kathie's family where she is.