The associate principal and activities director at Cedar Rapids Washington High School is the second official to resign in the wake of a scandal involving a substitute teacher's sexual relationship with a student.

The Cedar Rapids Community school District announced Tuesday that Mike Johnson reached an agreement to retire immediately. Johnson was the associate principal and had recently assumed the role of activities director.

The district says its investigation into the scandal is "nearing its completion" but declined again to give any specifics, citing it as a personnel matter.

Last week, longtime principal Dr. Ralph Plagman suddenly retired at the request of the district administration. Plagman admitted his initial action in the matter was the "wrong call" but said he acted on the best information he had available at the time.

The case revolves around accusations former substitute teacher Mary Beth Haglin had an inappropriate relationship with a Washington H.S. student during the 2015-16 school year.

The district says someone first reported the relationship in February of 2015 but an investigation determined the report unfounded when both Haglin and the student denied the relationship. New evidence surfaced in May 2015 and the district removed Haglin. However, the Grant Wood Area Education Agency, which helps coordinates substitutes for several districts, was not notified. That allowed Haglin to be placed as a sub at Harrison Elementary in June. Haglin was eventually removed and the district reported her to both the Iowa Board of Educational Examiners and Grant Wood AEA.

Haglin is now charged with sexual exploitation by a school employee.