Catherine Anne Cesnik was a Roman Catholic religious sister and a teacher at Archbishop Keough High School in Baltimore, Maryland, United States. On November 7, 1969, Cesnik disappeared. Her body was discovered on January 3, 1970, near a garbage dump in the Baltimore suburb of Lansdowne. Her unsolved murder served as the basis for the Netflix documentary series The Keepers in 2017.

Seton Keough High School was an all-girls college preparatory private, Roman Catholic high school in Baltimore, Maryland. It is located in the Roman Catholic Archdiocese of Baltimore, at 1201 Caton Avenue. It was founded in 1988 after the joining of the two schools, Archbishop Keough High School and Seton High School. The school closed in June 2017.