The guard had been fatally shot as he crouched behind a desk to take cover as the gunman sprayed the building’s lobby with bullets, police said.

Shane Tamura, the Park Ave. gunman who killed an NYPD officer and three others before taking his own life, left behind a suicide note saying he suffered from CTE, a brain injury often linked to playing football, police sources said Tuesday.

Browns rookie quarterback Shedeur Sanders got the attention of fellow Cleveland QB Kenny Pickett over the way he ran with the football. Blue Jays outfielder George Springer was struck in the head by a 96 mph pitch in the ninth inning and exited the game vs. the Orioles.

An NYPD officer, a Blackstone executive, a Rudin Management associate and a security guard were killed in the shooting at Manhattan's 345 Park Avenue.

The father of hero NYPD cop Didarul Islam grew so distraught when he learned of his son’s death at the hands of a deranged gunman in Midtown Manhattan that he suffered a stroke, his family told The Post.

The shooter was Shane Tamura; authorities say he was intending to target the NFL offices in Manhattan but entered the wrong elevator in the Midtown skyscraper.

The alleged gunman at a shooting rampage in a midtown Manhattan office building was identified as 27-year-old Shane Tamura, of Nevada.

Compared to what’s on the news, I don’t think any one of us, none of my teammates, sensed anything like this from Shane,” the former teammate told The Post.