CLAIRTON — A 15-year-old Clairton boy has been arrested on charges he robbed and killed an 82-year-old woman who lived nearby.

Johnie Washington III is charged as an adult with robbery, theft and criminal homicide by the Allegheny County police. He was awaiting arraignment after his arrest Tuesday.

Police say neighbors found Florence Ranta on her living room floor on Oct. 6. Police say she had been stabbed in the head and neck and died four days later at Mercy Hospital, Pittsburgh.

Police say Washington lived around the corner from the woman. Her car was missing the day she was robbed, but was found a short time later.

It's not clear if Washington has an attorney.