Article continues below advertisementRob Reiner and his wife Michele's son Nick has been arrested for murder following his parents' tragic deaths.The troubled drug addict was in the custody of the Los Angeles County Sheriff's Department as of Monday morning, December 15, online records revealed. He's now being held at Parker Center Jail in Downtown Los Angeles, with his bail set at $4 million.Nick is suspected to be responsible for taking a knife to Rob and Michele's throats inside of their Brentwood, Calif.