A western Pennsylvania man who told police he found his wife unconscious at the bottom of some steps is charged with strangling her.

Westmoreland County detectives say 41-year-old David Clarke, of Arnold, killed his wife sometime Saturday morning.

Police say he called 911 about 8:30 a.m. and told them he found 40-year-old Doreena Clarke unresponsive.

But authorities say an autopsy Sunday showed the women died of asphyxiation from being strangled by hand. Police say the autopsy also uncovered other "injuries not consistent with a natural death."

Clark has been jailed without bond since Monday night, but detectives didn't announce his arrest until Tuesday. He faces a preliminary hearing on charges of criminal homicide and first-degree murder on Jan. 29.