Rob Reiner Feared Son Nick After Party Fight, Before Double Murder

• Filmmaker Rob Reiner and his wife Michele Singer Reiner were found murdered in their Los Angeles home.
• Their son, Nick Reiner, was arrested in connection with the killings and is being held without bail.
• An altercation involving Nick at a Christmas party the night before the murders raised concerns about his erratic behavior and possible drug relapse.
• Rob Reiner had confided in friends about his fear of Nick and worries about his son's deteriorating mental state.
• Nick Reiner has a history of addiction and multiple rehabilitation stints, with family disagreements over his treatment.

Why It Matters: The tragic devastation of untreated mental illness and addiction.