New York State Police are mourning the death of Trooper Joseph Gallagher, a West Seneca native.

They say Gallagher died Friday, three years after he was hit by a vehicle while helping a disabled motorist.

Gallagher joined the State Police in 2014 and last worked out of a barracks on Long Island.

He leaves behind a wife and two children.

Governor Cuomo ordered flags on state government buildings to be flown at half-staff in Gallagher's honor.

"Trooper Gallagher is a hero to all New Yorkers — he dedicated his life to public service and worked to keep us safe," Governor Cuomo said in a statement. "His tragic passing is a reminder of the selfless actions so many brave first responders take each day. We will never forget him, and to honor his memory, I am directing flags be flown at half-staff to honor his memory."