Probably related:

2012-02-07 - Woman found dead and her body burning in a porch swing on her porch in West Frankfort, IL:
[link to thesouthern.com]

I'm gonna guess she was a smoker, went out to have a puff, lit up and a blast of gas burned her. Probably died very fast, else her body wouldn't have still been on the swing.

I think I am seeing why Obama gave up smoking. Heh, I did too, for the same reason - nice way to self-immolate.