New Delhi: Two days after a businessman was shot dead following a parking dispute in east Delhi’s Preet Vihar, police have nabbed 18-year-old Arush. He is another stepson of the main accused Gaurav Sharma.Pankaj Nayyar (34) was allegedly shot during a confrontation outside his brother Paras’ residence. Police earlier arrested Gaurav Sharma along with his associates Sunil Sharma (41) and Chain Singh Chauhan (42), both property dealers. Earlier, Gaurav’s elder stepson Siddharth (24) was also apprehended for his role in the incident.Investigators said the pistol used in the crime was unlicensed and is yet to be seized. Police said the dispute escalated from an argument over parking of vehicles in the neighbourhood.