New Delhi, Jan. 22 -- Police on Wednesday arrested another man in connection with the contract killing of 44-year-old Rachna Yadav, an Aam Aadmi Party (AAP) worker and residents' welfare association member in Shalimar Bagh. The accused, identified only as Sunny, 26, "actively participated" in the conspiracy by accompanying the hitman during reconnaissance on January 1 and transporting another suspect from Rohini to Panipat after Yadav was shot dead near her home, police said. Sunny worked at the Panipat Refinery Complex along with Sumit Kumar, 23, who was arrested on Monday for allegedly accompanying the hitman, Nikhil Chawla, on a stolen motorcycle during the killing. Sunny is the fourth person arrested in the case, additional commissioner of police (northwest) Bhisham Singh said. The prime conspirator, Bharat Yadav, 33, and the contract killer, Nikhil Chawla, 22, were arrested on Monday from a forested area in Bihar's Katihar, where they had been hiding. Rachna was shot dead on January 10 while returning home after attending a neighbour's funeral. The shooter fled with his associate on a motorcycle. Though CCTV captured the attacker's face, the case initially remained blind....