The Brief

NEW YORK CITY - New details are emerging about the gunman who opened fire inside the NFL’s Midtown Manhattan headquarters last week, killing four people before taking his own life.

What we know:

For years, Shane Tamura sought medical help for frequent and debilitating headaches, including head injections, according to a report by ESPN.

Sources tell the sports news outlet that the 27-year-old Las Vegas casino worker "regularly met with doctors, including a neurologist, and received yearly MRI exams and various treatments seeking to diagnose the cause and stop the pain."

The headaches reportedly began when he started playing high school football, and continued into adulthood.

Dig deeper:

Tamura had a documented history of mental health struggles, being involuntarily hos

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