7/7/11 – A 22-year-old Madison woman has been arrested in connection with the death of her three-year-old son. Maria Castillo-Dominguez had told investigators the boy hit his head on a wall and that was why he was admitted to UW Hospital last Thursday. Police were notified of the injury the next day and the child died Sunday. The autopsy was completed Tuesday and Castillo-Dominguez was taken into custody shortly after. Castillo-Dominguez told detectives she hit her son, causing his head to hit the wall. City of Madison Police and the Dane County Medical Examiners office are handing the case.