Gun-totting Maoists shot dead a contractor and former tribal village head in Mudulipada area of Odisha's Malkangiri district on Saturday, suspecting him to be a police informer, said the police. The victim, identified as Budra Dhangda Majhi, had gone to the market at Khairput, nearly 70 km from Malkangiri, when three ultras fired at him, Inspector In-Charge of Mudulipada police station Rajesh Chatria said.