The frantic mom of mass shooter Shane Tamura had repeatedly called 911 on her mentally ill son in the years before he shot up a Manhattan skyscraper — once telling cops he was threatening to kill himself and that he suffered from a sports-related concussion, newly released audio shows.

The evidence documents Tamura's years-long struggle with mental health before he opened fire in a Midtown office building.

Park Ave. gunman Shane Tamura, who killed an NYPD cop and three civilians before taking his own life inside a Midtown Manhattan office building last week, was polite to cops during multiple encounters with the Las Vegas Police Department, body-worn camera footage released Wednesday shows.

Las Vegas police release bodycam footage and 911 calls from Manhattan mass shooter Shane Tamura showing mental health episodes and arrests before the deadly shooting