A wanted gangster involved in a robbery worth ₹1.5 crore at a jewellery store was killed in an encounter with the police in Sultanpur on Thursday, officials said. Mangesh Yadav was carrying a bounty of ₹1 lakh on his head. He, along with four others, had robbed the jewellery store in Varanasi's Thatheri Bazar on August 28, the police said.