A hit-and-run driver killed a woman in Brooklyn early Saturday, police said.

The unidentified woman, who was in her 40s, was found about 4:30 a.m. lying at the intersection of Atlantic and Pennsylvania avenues in Cypress Hills, officials said.

She had head trauma and was taken to Brookdale Hospital, where she was pronounced dead.

The driver fled the scene, police said.

The NYPD’s Collision Investigation Squad is investigating the crash.