MUMBAI, July 30 -- Senior police inspector Daya Nayak, who gained recognition as an "encounter specialist" in the 1990s, was promoted to assistant commissioner of police on Tuesday, two days before his retirement. Nayak, who heads Unit 9 of the Mumbai crime branch, is scheduled to retire on July 31. Senior inspectors Jeevan Kharat, Deepak Dalvi, and Pandurang Pawar, who are also set to retire on Thursday, were promoted too. Nayak, who joined the police force in 1995, gained recognition for gunning down several gangsters in police encounters. He has shot around 87 gangsters, including criminals linked to the likes of Dawood Ibrahim, Arun Gawli, Amar Naik and Chhota Rajan. In 2006, Nayak was suspended after former journalist Ketan Tirodkar alleged that he owned assets disproportionate to his known source of income. He was reinstated in the police force in 2012, after the Supreme Court quashed all charges. Nayak was more recently involved in investigating high-profile cases such as the firing outside actor Salman Khan's house, the killing of NCP leader Baba Siddique, and the knife attack on actor Saif Ali Khan....