MacLean, Diana C. of Burlington, formerly of Lexington, April 17, 2021. Daughter of the late Robert C. MacLean and Anna (Lewis) MacLean. She is survived by her sister Barbara A. MacLean of Burlington, and by many close relatives and friends. Diana was a mathematics teacher at Concord Carlisle Regional High School. A Mass of Christian burial will be held Thursday April 22 at St. Brigid Church, 1984 Mass. Ave. Lexington at 11am. Visitation at the Douglass Funeral Home, 51 Worthen Rd. Lexington Thursday, immediately prior to the Mass, from 10am to 10:45am. Relatives and friends are kindly invited. Private interment Woodlawn Cemetery, Everett.