LEWISTON — The Lewiston High School Class of 2019 will be the last to receive its diplomas from Superintendent Bill Webster, who has announced he will retire in a year. Bill Webster In a letter Tuesday to School Committee Chairman Francis Gagnon, Webster said his resignation is effective June 30, 2019. He is giving a year’s notice so the board has time to search for a new superintendent. Webster said he has been “blessed” with living in Lewiston and being the superintendent. “The quality of committed educators and community members helps ensure that our schools and community will continue to strengthen in the years ahead,” he said. Webster was hired in November 2010, replacing Leon Levesque. Webster, 68, said his age is part of his reason for retiring. “As much as I enjoy my work and enjoy Lewiston, my colleagues and friends,” he said, “I want to make sure I do what I want to do while I’m in good health.” The School Committee will have a workshop on Monday with Steve Bailey of the Maine School Management Association to start the search of finding a new superintendent. Webster said in 2010 he decided to apply for Lewiston superintendent in part because he was “excited” by the city’s growing immigrant population.