(Portland, OR)  --  The mother of a 27-year-old man who was shot and killed by Portland police two years ago is encouraging protesters to keep marching.  Letha Winston addressed a crowd of Black Lives Matter demonstrators outside the Justice Center last night, saying "a change is going to come."  She urged protesters to never let anyone discourage them from seeking justice.  Winston's son Patrick Kimmons was shot to death by police in September of 2018 after he allegedly shot and injured two men in a parking lot downtown.  Last night was the 81st consecutive night of protests against police brutality and systemic racism in Portland following the police killing of George Floyd in Minneapolis in May.