Ukrainian authorities found the bodies of the mayor and four others in the village of Motyzhyn, west of Kyiv. The dead included mayor Olga Sukhenko, her husband, son, and two others who were not part of her family.
Police said the dead had their hands tied behind their back.
Four bodies, including that of the mayor, were found half buried in a grave in a pine forest near her house, reported French news agency AFP. A fifth body was discovered in a little well in the home's garden.
Police said 50-year-old Sukhenko, her husband, and son were abducted on March 24 when they refused to collaborate with invading Russian forces.