Gurugram, June 29 -- The 25-year-old woman whose body was found buried in a pit outside her husband's house in Faridabad was murdered by her in-laws as they suspected she was planning to file for divorce, police said on Saturday, adding that the family feared a legal separation would force them to pay alimony and maintenance, prompting them to conspire and carry out the killing. The woman's 25-year-old sister-in-law has now been arrested for her role in the crime. Her father-in-law and mother-in-law were arrested previously. Her husband is on the run, police said. "After Tannu Rajput was murdered, her sister-in-law Kajal Singh came out of the house at 4am on April 22 to ensure no neighbours were watching. She then signalled her father and brother that the coast was clear, after which they dragged the body out and buried it in a soak-pit," said Mukesh Kumar, deputy commissioner of police (crime), Faridabad. Kajal will be produced in court on Sunday and is likely to be taken into police custody. According to police, the murder was premeditated and orchestrated by the woman's father-in-law, Bhoop Singh, 54, when it became clear that the marriage was collapsing and the woman would likely approach court for divorce. Rajput married Arun Singh, 28, on June 21, 2023, but left for her parental home in Firozabad, Uttar Pradesh, within three months due to domestic disputes and alleged dowry demands. After family intervention, she returned to her in-laws' home in October 2024, but the situation worsened again, said Kumar. "Bhoop wanted to avoid paying alimony, maintenance and wedding expenses up to Rs.20 lakh to the woman's family after divorce and decided to murder her," the DCP said. According to the plan, police said that Bhoop dropped his wife at a relative's house in Uttar Pradesh on April 18. Two days later, he got a soak-pit dug in front of his house under the pretext of installing a sewage connection, exploiting the fact that the neighbourhood was unregularised and such construction could go unnoticed, the DCP said. "On the night of April 21, the family gave Rajput sugarcane juice laced with sleeping pills and after midnight, she was strangled to death in her sleep and the body was buried by Bhoop and Arun after they received the green signal from Kajal," the DCP said....