NEW YORK (Reuters) - The estranged wife of Robert F. Kennedy Jr. died from asphyxiation due to hanging, an autopsy revealed on Thursday, in an apparent suicide at the family's suburban New York home. A spokeswoman for the Westchester County Medical Examiner's Office, Donna Greene, said the autopsy performed on Mary Kennedy, 52, revealed she died of suffocation. "The cause of death was put at asphyxiation due to hanging," Greene said. Results of toxicology tests would not be ready for several months, she said. ...

DETROIT (Reuters) - General Motors Co, the largest U.S. automaker, will begin selling its first rear-wheel-drive performance sedan under the Chevrolet brand in the United States in 17 years, it said Thursday. The Chevrolet SS will be equipped with a V8 engine and built as a 2014 model. It will arrive in showrooms in late 2013. The production car will also double as GM's NASCAR race car and will debut in the 2013 Daytona 500 next year. The NASCAR version and the one to be sold in showrooms look so much alike that GM plans to camouflage the NASCAR model while testing, spokesman Monte Doran said. ...