No motive has been announced. A suicide note was found expressing grievances with the NFL and saying Tamura suffered from CTE, a source said. Follow for live updates.

The NYPD sent detectives to Las Vegas to work with federal law enforcement in the investigation into Monday's deadly shooting inside a Midtown Manhattan office building.

The supervisor, who worked in the surveillance department at the Horseshoe Las Vegas, has not been publicly identified. Authorities say the individual has been cooperative and is not facing any charges at this time.