BBM I agree. She was 15 weeks pregnant, tired, not feeling well, it was 2 am and she had a doctor's appointment that morning. No way.
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http://www.ncdsv.org/images/strangulation_article.pdf
Only eleven pounds of pressure placed on both carotid arteries for ten seconds is necessary to cause unconsciousness.4 How-ever, if pressure is released immediately, consciousness will be regained within ten seconds. To completely close off the trachea,
three times as much pressure (33 lbs.) is required.
Brain death will occur in 4 to 5 minutes, if strangulation persists.
And if you believe his story, this would have happened in the "moment" he went downstairs.
MOO