NEW YORK — A man who was walking down a street outside a school near Central Park was shot in the back of the head Monday and lay mortally wounded in a pool of blood as his killer escaped with a getaway driver, police said.

The shooting occurred around 2 p.m. outside the Saint Thomas Choir School, a small boarding school for young boys on a fairly quiet street between busy avenues teeming with tourists and shoppers.

The gunman, wearing a dark coat with a dark hood and khaki pants, came up behind 31-year-old Brandon Lincoln Woodard, of Los Angeles, and fired what appeared to be a silver semi-automatic pistol, striking him once, police spokesman Paul Browne said.

No motive had been revealed.

It’s believed the shooter and the getaway driver may have been in the neighborhood, just blocks from Central Park and Columbus Circle, for some time.

The suspects escaped in a light gray or silver Lincoln sedan.

The killing occurred on a nondescript, unassuming block of West 58th Street, with construction scaffolding, a piano store and an apartment building at the corner.

None of the 38 boys studying at the school witnessed the shooting because they were at a church rehearsing, school receptionist Allie Roma said.