Rock guitarist Eric Clapton's 4 1/2-year-old son fell to his death from a 53rd-floor window left open by a housekeeper, police say.

The musician, who was not in the apartment when his only son fell Wednesday, took the news hard. Traumatized, he was examined at a hospital emergency room and later released.A housekeeper in the Manhattan apartment had just finished cleaning the glass and had left the 4-by-6-foot, unbarred window open to air out the room when the boy, Conor, ran past him and fell, said Officer Kim Royster.

The child landed on the roof of an adjacent four-story building, Royster said.

The boy's mother, Italian TV star Lori Del Santo, was home at the time.

The child's parents were not married and did not see each other much recently, a spokesman said.

City law requires owners of most residential buildings to install window guards in apartments where children under 12 live. Condominiums like the building where the accident happen are exempt from that ordinance.

Clapton, a founding member of Cream and Derek & the Dominos, is considered one of the greatest rock guitarists. He wrote and performed the classics "Layla" and "Let it Rain." Other hits include "Cocaine" and "I Shot the Sheriff."

In honor of the boy's birth in August 1986, Clapton named an album "August."