"The funeral was a solemn affair with a few friends present, " her daughter Usha Ratra told PTI.

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Dr Talakere Usha Kiran, who led the study, said it was not clear why obese women had this increased risk.

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Usha Chaumar was singled out for her amazing accomplishments: She can read and write now and is no longer doing the dirtiest of work.

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"We can't predict the future of the marriage, " says Usha, cautiously.

BBC: India's 'wedding detectives' enjoy booming trade

Both Mr Rai and Usha say they have yet to be found out, but the watertight nature of such investigations could be open to question given cases like Manish's.

BBC: India's 'wedding detectives' enjoy booming trade

Indeed, they would probably have started thinking about differentiation anyway, even had China remained closed to the outside world, says Usha Haley, an expert on Asian business from the University of Tennessee.

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"We study the mother-in-law, " says Usha.

BBC: India's 'wedding detectives' enjoy booming trade