The family of an elementary school principal who hanged himself in March demanded compensation Monday over his death, saying the suicide was a result of his official duties.

Kazuhiro Keitoku, 56, principal of Takasu Elementary School in Onomichi, Hiroshima Prefecture, hanged himself March 9 on the school grounds after suffering from depression, according to a police investigation.

Keitoku, who previously worked as a banker, was hired as a principal in April 2002 as part of a prefectural project to recruit more principals with a private-sector background. However, he was troubled by the lack of trust between himself and the teachers and had been suffering depression, according to the investigation.

Keitoku's wife, Yuko, submitted documents Monday demanding compensation from the elementary school.