The CBI filed a chargesheet in a local court on Friday in connection with alleged gangrape and murder case of case of a 19-year-old Dalit woman in Hathras. The agency invoked charges of gangrape and murder against four accused-Sandeep, Luvkush, Ravi and Ramu. The Dalit woman was allegedly raped by four upper-caste men in Hathras on September 14. She died on September 29 at Delhi's Safdarjung Hospital during treatment.