The Liberals won a majority government in the provincial election of 2003, although Agostino was re-elected with a somewhat reduced margin of victory. To the surprise of many in the province, he was not appointed to the first cabinet of Dalton McGuinty in October 2003. This was widely interpreted as a snub, but subsequent events cast the decision in a much different light: Agostino died on March 24, 2004, of liver cancer. He had been battling the disease for some time and had undergone surgery during the 2003 campaign, although this information was not made public until his death.