Sergeant Majang Skalkie said 69-year-old Daniel Meyer Wybenga was found bound with rope on the bathroom floor on Monday.
Police suspected he was strangled. His gold-coloured Toyota Corolla, cellphone, and music system were missing from the house.
Police were still searching for the robbers and appealed to the community to come forward with information. Charges of murder, house robbery, and vehicle theft were being investigated.