Rob Reiner and his wife Michele Reiner were found dead in their Brentwood home after Los Angeles Fire Department responders answered emergency calls and their daughter Romy Reiner is reported to have discovered the bodies.Los Angeles Police Department detectives arrested the couple’s 32-year-old son, Nick Reiner, several hours later; LAPD said he was taken into custody and was booked on murder charges while prosecutors have taken over the inquiry and will decide whether to file formal charges.Investigators have said they believe the couple were stabbed and continue to gather forensic evidence, process the family home and interview witnesses while authorities caution the public and media to avoid speculation.