Robert Durst is expected to take the stand in his own defense in a Los Angeles County court Thursday in a rare move considered extremely risky for a defendant in a murder trial.Durst is charged with killing his best friend Susan Berman, who was shot and killed in her home in 2000.Prosecutors are set to resume their cross-examination of the only other defense witness, false memory expert Elizabeth Loftus, to begin the day, and should defense attorneys go through with their plans to call the