CHICAGO (AP) — A judge decided to appoint a special prosecutor Friday to investigate the decision by Cook County prosecutors to dismiss all charges against actor Jussie Smollett, who was accused of lying to the police by claiming he was the victim of a racist and homophobic attack in downtown Chicago in January.

In a ruling that leaves open the possibility that Smollett could be charged again, Cook County Judge Michael Toomin suggested that the county's state's attorney, Kim Foxx, mishandled the Smollett case by appointing a top aide to oversee it after she recused herself.

Foxx had been in co...