The murder of Russian opposition figure Boris Nemtsov, right outside the Kremlin in the heart of Moscow, has prompted a lot of speculation about what role, if any, Vladimir Putin played in the killing. Jon Stewart didn't directly point the finger at Putin on Thursday night's Daily Show, but he did laugh at the Russian president's insistence that he will personally lead the investigation into Nemtsov's murder. "Oh good, he's vowing to find the real killer," Stewart laughed, showing a photo of OJ Simpson.