Seeta Kaur, who has been named for the first time this week after her case emerged earlier this month, was a mother of four whodied in "highly suspicious circumstances" in March 2015 after refusing to allow one of her sons to be adopted by her childless brother-in-law, during a trip to Haryana.
Her UK-based family, including twin sister Geeta, claim the 33-year-old was the victim of "a classic case of honour killing" with MPs Naz Shah and Kate Osamor now backing them at an event in the British Parliament complex to launch the 'Justice for Seeta' campaign this week.
Southall Black Sisters, a UK-based human rights group for minority women, is leading the a campaign, claiming Seeta's family have been unable to get Indian police to investigate her death properly.
"OnMarch 31, her family in London received a call in the middle of the night to say that she had died. The ostensible cause of death was a heart attack.
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Seeta's four young children remain in India with their father even though they were made wards of the court by a British High Court in April 2015, ordering their immediate return to the UK.
"No assistance has been offered by any British agency to get the children back to this country," said Gupta.
They allege that her husband resigned his job, tried to sell his car and cancelled his car insurance before the trip with the intention of not returning to the UK.
Shamik Dutta, a lawyer acting for the family, said "If our police forces are serious about honour-based violence and honour-based killing they must recognise the extraterritorial nature of that crime and make sure that perpetrators do not feel they have anywhere to hide".
Earlier this month the family had written to UK foreign secretary Boris Johnson, calling for a new investigation.
In the letter to Johnson, representatives of the family say Seeta was "tricked" into going on a family trip to India, where she died after a heated argument with her husband.
The husband, a Hindu builder who lives with his family in north London, could not be contacted for comment.
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