New Details Emerge in Nick Reiner Case: Bloody Hotel Room, Party Fight Before Parents' Murder

• Nick Reiner arrested for the murder of parents Rob Reiner and Michele Singer Reiner, found stabbed at their Brentwood home.
• He checked into The Pierside Santa Monica hotel hours after a public argument with his father at Conan O’Brien’s Christmas party.
• Witnesses described Nick as erratic at the party; his hotel room was later found blood-soaked with covered windows.
• Sister Romy Reiner, who found the bodies, named Nick as a dangerous suspect to investigators.
• Nick Reiner has a history of substance abuse and mental health issues, with the party argument possibly about rehab.

Why It Matters: New details link Nick Reiner's erratic behavior and a bloody hotel room to his parents' murder.