Article continues below advertisementRob Reiner and his wife Michele's throats were slit by a family member during a horrific attack inside of their Los Angeles home.According to reports, the Hollywood couple was murdered after an argument erupted on Sunday afternoon, December 14, in Brentwood, Calif., allegedly causing their son Nick to take a knife to his parents' throats.As OK! previously reported, Nick, a troubled drug addict, is believed to be the one who killed Rob and Michele and is being questioned by police in connection with his mom and dad's deaths.