India, July 29 -- Shane Devon Tamura, the shooter who opened fire inside the NFL's headquarters building in New York City on Monday, reportedly left a suicide note which claimed that he suffered from chronic traumatic encephalopathy (CTE) and wanted his brain to be examined.

Tamura, 27, was identified by authorities as the main suspect in the Manhattan incident that left four people, including police officer Didarul Islam, dead and one injured. According to authorities, the shooter died by suicide.

Citing an unnamed person familiar with the inquiry, CNN stated that a suicide note declaring that the suspect had CTE was found in his back pocket.

CNN reported that Tamura was a competitive football player in his younger years. The note sta...