Nick Reiner, the 32-year-old son of Hollywood luminary Rob Reiner and Michele Singer Reiner, pleaded not guilty to two counts of first-degree murder more than two months after their deaths, denying for the first time that he fatally stabbed his parents. Reiner's attorney, Deputy Public Defender Kimberly Greene, on Monday entered the plea on his behalf as he stood behind glass in an enclosed custody area of the packed Los Angeles courtroom. The third of Rob Reiner's four children, Nick Reiner has been held without bail since his arrest hours after beloved actor-director Reiner and photographer and producer Singer were found dead on December 14 at their home in the upscale Brentwood section of Los Angeles. Reiner appeared in court with a shaved head and light facial hair, wearing brown jail clothes. He talked to his lawyer briefly through the glass before the judge began the hearing. At one point a low door in the enclosure was opened and they crouched down and spoke face-to-face. ..