An initial police investigation showed that Wu Huanming had been unhappy after a property dispute with Wu Hongying.
Wu Huanming had rented out his house to Wu Hongying to accommodate the kindergarten, without approval from any government departments.
Wu Huanming demanded in April that his house should be vacated when the lease expired, but Wu Hongying said she hoped to return the property in June or July, during the kindergarten vacation.
Police are still investigating the circumstances of the case.