No topic was off limits for David Letterman, 73, in a new interview with Kim Kardashian, 39 — including OJ Simpson‘s murder trial that had her parents Kris Jenner, 64, and the late Robert Kardashian Sr. taking sides. Robert, of course, is best known for his role on OJ’s legal defense team alongside lawyer Johnnie Cochran, while Kris was a close friend of the late Nicole Brown Simpson.