Park Avenue gunman Shane Tamura, who killed an NYPD officer and three others before taking his own life in a midtown Manhattan office building, did — as he contended in a suicide note — suffer from the brain disease known as CTE, the Medical Examiner said Friday.

The examination of Tamura’s , brain “has found unambiguous diagnostic evidence of Chronic Traumatic Encephalopathy, also known as CTE,…” the Office of the Chief Medical Examiner said in a statement.

“The findings correspond with the classification of low-stage CTE, according to current consensus criteria,” the statement said. “CTE may be found in the brains of decedents with a history of repeated exposure to head trauma. The science around this condition continues to evolve, and the physical and mental manifestations of CTE

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