Overview

• Shane Tamura drove from Las Vegas to 345 Park Avenue armed with an AR-15 legally sold by his Horseshoe Las Vegas supervisor.
• Seeking the NFL offices, Tamura mistakenly entered the Rudin Management elevator bank and fatally shot police officer Didarul Islam, Blackstone executive Wesley LePatner, security guard Aland Etienne and administrator Julia Hyman before killing himself.
• Investigators recovered a handwritten note blaming chronic traumatic encephalopathy and accusing the NFL of hiding sport-related brain-injury risks.
• The New York Police Department is examining Tamura’s mental-health history, the legality of his rifle purchase and the sourcing of weapon parts.
• NYPD detectives have traveled to Las Vegas to execute search warrants on Tamura’s apartment, casino locker and electronic devices as they deepen efforts to clarify his background.