The Crime Branch of Delhi Police filed a charge-sheet against six persons in the Nikki Yadav murder case on Friday. She was murdered by her live-in partner, Sahil Gehlot, and her body was stored in the refrigerator at his eatery in southwest Delhi's Mitraon village. The 576-page charge-sheet has listed 71 witnesses, four of the main ones being Nikki's younger sister, a male friend, the enquiry officer at Anand Vihar railway station and a security guard at Nigambodh Ghat.