Calm Nick Reiner Seen Hours Before Parents' Stabbing Deaths In New Footage

• New surveillance footage shows Nick Reiner walking calmly near his parents' Brentwood home hours before their alleged murders.
• Rob and Michele Reiner were found dead Sunday; their daughter Romy later warned police her brother was "dangerous."
• Reiner is charged with two counts of first-degree murder, facing possible life imprisonment or the death penalty.
• He reportedly had a loud argument with his parents and a confrontation with Bill Hader at a holiday party earlier that night.
• Blood was found in Reiner's Santa Monica hotel room; he was arrested without resistance near the USC campus.

Why It Matters: Surveillance footage reveals Nick Reiner's calm demeanor hours before allegedly murdering his parents.