The office on Thursday announced the dismissal of charges against all eight remaining defendants, including an involuntary manslaughter charge against Nick Lyon, the former director of the Department of Health and Human Services.
Charges were also dismissed against other officials from the health department, plus two former Flint emergency managers and current or former employees of the Michigan Department of Environmental Quality and the City of Flint.
Seven had earlier pleaded no contest to misdemeanors, with expectations they would cooperate with other pending prosecutions and their records would eventually be wiped clean.
Flint residents reacted with shock and confusion.
The statement from the office of Attorney General Dana Nessel said the dismissals were a response to problems with the original investigation, launched under Schuette, and don't preclude recharging the original defendants or adding new ones.