A Brazilian environmentalist was killed Friday in the Amazon Rainforest region, three days after the murders of two other environmental activists in the area, authorities said.Adelino Ramos, known as Dinho and a leader among local impoverished farmers, was killed Friday morning while selling vegetables produced in the farming settlement in Porto Velho in the state of Rondonia.He was shot six times by an unidentified man on a motorbike.Reports said Ramos was receiving threats for denouncing illegal logging in the Amazon region along the border between Rondonia and the states of Acre and Amazonas. He also fought for land reforms in the region.On Tuesday, Jose Claudio Ribeiro da Silva and his wife Maria do Espirito Santo da Silva were killed in the town of Nova Ipixuna in the state of Para.The couple was also being threatened for trying to protect the Amazon Rainforest.