The deaths of a wealthy Indian-origin couple and their teenage daughter, who were found dead in their sprawling $5 million mansion in Massachusetts in the US last week, have been ruled as murder-suicide by medical authorities after an autopsy.The deaths of a wealthy Indian-origin couple and their teenage daughter, who were found dead in their sprawling $5 million mansion in Massachusetts in the US last week, have been ruled as murder-suicide by medical authorities after an autopsy.