DCP (New Delhi) Madhur Verma said a team, led by additional DCP Shobhit Saxena, arrested Gulati, 34, on Saturday morning from his house in East Patel Nagar. He has been booked for causing death due to negligence. The cops also seized the car from a local garage.Police had only some broken pieces of the mudguard of the car to work on. A CCTV had captured the incident but the numberplate was not legible. So, they began accessing other footage from the stretch and created a digital map. The broken pieces were being matched with the cars that were seen passing through that stretch during the time of the accident.Finally, they confirmed that it was a black Hyundai Creta, and tracking it through the footage they managed to identify the route it had taken . The broken pieces of the mudguard had a barcode, using which the company identified the car. The cops now had the registration number and they knocked on Gulati's door.The police account of that night is based on what Gulati is claimed to have told them. A senior sales manager of the FM channel, which has its office in the Okhla Industrial Area, he had gone partying with his friends on the night of June 29. The group first went to a club at Nehru Place in south Delhi at 12.30am. From there, they went to another club in Chanakyapuri at 2.30am.Gulati is claimed to have told the police that he and his friends remained there for two-and-a-half hours. His friends then retired for the night but Gulati was in no mood to go home. He headed for another club in Connaught Place. He was driving at a high speed and encountered Kumar even as he was looking at his mobile phone.However, rather than stop and rush the injured man to a hospital, Gulati drove away from the spot and managed to keep his secret till the police reached him on Saturday.Dhiraj's brother had met chief minister Arvind Kejriwal and alleged that his brother's scooter was hit deliberately, indicating a murder. The CM had on Friday asked the chief secretary to order a magisterial inquiry and also written to the LG, requesting him to ask the police commissioner to carry out a "fair, thorough and expeditious" investigation into the case.