1990 election Corruption allegations had taken a toll on incumbent Republican
James E. O'Grady's prospects for reelection. O'Grady ultimately had failed to live up to his 1986 campaign promises of disposing of politics and corruption in the
Cook County Sheriff's Office, and had become unpopular among his constituents. Amid the 1990 campaign, a Cook County correctional officer was shot and critically wounded while hanging signs for Sheahan outside of the
South Side bar. Three men, including a correctional officer who supported O'Grady, were arrested for this. In 1990, Sheahan defeated O'Grady by a broad margin. Early into his tenure, he received praise for running what appeared to be a much less corrupt Sheriff's Office than his predecessors had. He also received criticism over abuse of inmates by jail guards. In November 2005, he announced that he would not be seeking reelection
the following year. His term would end in December 2006. ==Personal life==