Mrs D. had an autopsy. Certainly the medical examiner knows for certain. But, it seems a bit of a stretch that whoever did this would leave behind "his" dna inside Mrs D. And, imo Mr. D's head was taken because the perps couldn't retrieve the bullet used to kill him.They are basing the idea that she was not sexually assaulted, because she was found clothed. But a devious perp can put the clothes back on her. Sorry, if a guy's head is cut off, it's not that much of a stretch to consider that the wife was sexually assaulted.