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Keith MacPherson, a longtime Waltham police official, was sworn in as the city’s police chief Monday night after the City Council voted unanimously to appoint him to the job. MacPherson will fill the position vacated by Thomas LaCroix, who resigned last summer after being convicted by a Concord District Court jury of assaulting his wife. Mayor Jeannette McCarthy in January recommended MacPherson to take the position, which he started filling on an interim basis after LaCroix was placed on administrative leave last summer.