Yet, on March 22, 1689, Shigemasa suffered kaieki (sudden dismissal and deprivation of position, privileges and properties), which incident resulted in the downfall of the Kitami clan (one theory holds that he was held responsible for one branch family's involvement in a sword fight).
しかし、元禄2年(1689年)2月2日_(旧暦)に突然改易され、大名である喜多見氏は滅びた（分家の刃傷事件に連座したともされる）。