Gurgaon:At least four people were arrested for killing a bar attendant on the Delhi-Gurgaon expressway on Friday, police said. Three men and a woman were arrested for killing Mahi, a 20-year-old bar attendant, DLF phase 2 police chief Sudip Kumar said. The official said Mahi had a dispute with another bar girl belonging to West Bengal. She, along with three men, beat her up at Shankar Chowk early on Friday. The victim was rushed to hospital but declared brought dead, Kumar added.