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life. and then, suddenly, one day, she was gone. poisoned by carbon monoxide. >> he's like, i couldn't get a pulse! i couldn't get a pulse! i couldn't get a pulse! >> her husband blamed of faulty water heater. police blamed him. >> you don't think this is an accident. >> no. >> there was just one problem. and it was a big one. no one could figure out exactly how he might have done it. >> he's an expert at gases. >> murder or accident? >> did you kill your wife? ♪ ♪ ♪ >> hello and welcome to dateline. hundreds of americans die every year from accidental carbon monoxide poisoning...

And all of the guards and it was not a pleasant work involvement. >> the new documentary on the crash of twa 800 and raising questions of a cover up. six whistle blowers say they don't believe the ntsb ruling that it was a electrical short circuit and an explosion in the gas tank. they want the case reopened and others are standing by the original findings. dr. michael bodden was a chief medical examiner. and governor patacky charged you for being investigation. >> we found no evidence that any of the bodies had any kind of fragments or chap nel that is normally produced by a bomb