Demetra (Tikellis) Apostolou, 83, died Wednesday, March 10, at Anna Jaques Hospital. Born in Haverhill, she attended Roger’s Hall and Pine Manor. Apostolou worked as a real estate and insurance broker. As an active parishioner of the Holy Apostle Greek Church in Haverhill, she sang in the choir and served as secretary to Father Makarios. Funeral services are Saturday, March 14, at Holy Apostles Greek Orthodox Church, 154 Winter St., Haverhill. Visiting hours are 10-11 a.m. Interment follows at Walnut Cemetery.