A missing four-year-old boy was found dead in a slough near Lougheed, Alta. on Wednesday.

Police say the child had been visiting relatives with his mother when he left the house.

Believing the boy was with another family member, his absence was not noticed for an hour.

When they realized he was on his own, the family called police and began searching the property.

Just before RCMP arrived, the family found the boy lying face-down in a nearby slough. He was not breathing.

STARS air ambulance was called out and EMS personnel tried to resuscitate him but were unable to revive the boy, who was pronounced dead at the scene.

By the family’s request, the RCMP will not be releasing the boy’s name.