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mother. >> she was the most amazing woman i had ever met in my life. >> and then, suddenly, one day, she was gone poisoned by carbon monoxide. >> he was like 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 one problem, and it was a big one, no one could figure out exactly how he might have done it. >> he's an expert in gases, he's analyses urologist. >> murder or an accident. did you kill your wife? ♪ ♪ ♪ >> hello, and welcome to dateline, hundreds of ame...

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...

DNA found in the New York man’s trash connected him to the crime scene in Germany, feds say.

A towel under the bedroom door, a fan blowing, and a bathroom window open. that was because the toilet in the master -- mark said he wanted to keep the smell out of the rest of the house. kathy's family knew about the problem with the toilet, but they figured, there was a different explanation for the towel, the fan in, the open window. they believed mark knew there was carbon monoxide in the house, because he had somehow put it there. and he was protecting himself from poisoning. >> how did you respond to that? the suspicion that was placed on you. >> i was devastated. >> five months after ka...