According to a complaint filed by Narendra Tiwari, a resident of village Sehatpur Faridabad, his daughter Nidhi Tiwari got married to Anand Tiwari, a resident of Lakadpur in Faridabad, on February 23, 2012.
His daughter had been complaining that she was being harassed by her in-laws for want of dowry.
The complainant said that he had earlier given a motorcycle to his daughter upon her in-laws' demand.
The woman's mother-in-law Swabhavti and brother-in-law beat her up every now and then for want of more dowry, the woman's father alleged.
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Upon reaching the hospital, Narendra was told that his daughter had hanged herself and breathed her last during treatment.
The woman's family has accused her father-in-law Ramaji Lal, mother-in-law Swabhavati and younger brother-in-law for the 'killing'.
A complaint was filed at the Surajkund police station yesterday.
Police have started investigations in the case, said investigating officer ASI Hari Kishan.