Frans Hooijmaijers (October 24, 1935 – August 20, 2006), known as Fat Frans (Dutch: Dikke Frans), was a Dutch serial killer and former nurse who was convicted for killing five patients at a hospital in Kerkrade from 1970 to 1975, but was suspected to have killed approximately 259 people. After serving 18 years for his confirmed murders, he was released in 1987 and lived as a free man until his death in 2006.