(CNN) Marjory Stoneman Douglas High School Principal Ty Thompson announced that he is stepping down at the end of the school year, citing the toll of the job on his health and family.

Thompson had led the school in Parkland, Florida, as it recovered after a gunman stormed the campus and killed 17 people on February 14, 2018. He was not at school that day.

Several teachers told CNN that Thompson broke down in tears when he told staff and faculty in an emotional face-to-face meeting after classes on Friday.

Broward County Public Schools is investigating four individuals, including three assistant principals and one principal, in relation to the shooting, according to Broward County spokesperson Nadine Drew. The principal is Thompson , officials previously said.

The investigation is expected to be completed by the end of the school year.

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