A former Major League Baseball pitcher who left the mound to become a Port Authority cop was killed in a wrong-way crash Sunday — while headed to work at Manhattan’s 9/11 service, cops and sources said.

Tragic Officer Anthony Varvaro, 37 — a Staten Island native who pitched mainly for the Atlanta Braves during his six-year MLB career — joined the Port Authority Police Department in 2016, starting out at the World Trade Center Command, according to American Police Beat magazine.

The married father of four eventually became an instructor at the department’s police academy, the mag said in February — and a Port Authority source told The Post on Sunday that Varvaro was headed to work at the commemoration of the 21st anniversary of the 9/11 terror attacks at the World Trade Center when he was killed.

“He was a real sweetheart,” said a Staten Island baseball coach whose team had played against kids coached by Varvaro.