Maryann Sally Lorimer, 43, director of Christian education at St. Mark's Episcopal Church on Capitol Hill, died Friday of cancer at her Northeast home.

A native of Boston, Mrs. Lorimer was in 1957 graduate of the University of Connecticut, That same year she married Thomas Lorimer and they moved to Washington about 15 years ago.

She taught for a time in the city's public schools. For about the last 12 years she was actively involved in Christian education programs at St. mark's Church, as a teacher of children and adults and then as a director.

In 1976, mrs. lorimer received a master's degree in social work from Catholic University and in January became a social worker in the Fairfax County schools.

In March, Mrs. lorimer's cancer was diagnosed as terminal and since then she had remained at home.

In he memory, a group of fellow students at Catholic University has organized a student loan fund for part-time students, called the Sally Lorimer Fund. Contributions may be made through the National Catholic Social Workers Society at CU.

In addition to her husband, Mrs. Lorimer is survived by two children, Phyllis, 18, and Seth, 13, all of the home: her mother, Leon Summers and a sisters. Virginia Martucci, both of Newington, Conn., and a brother, John Summers, of Rockville, Conn.