King & Spalding LLP has enlisted three former federal prosecutors to the firm’s Chicago office since August.Patrick M. Otlewski, a former assistant U.S. attorney for the Northern District of Illinois, is the latest addition to King & Spalding’s special matters and government investigations group.He joins Zachary T. Fardon, former U.S. attorney for the Northern District of Illinois, and Patrick M. Collins, who also served as a federal prosecutor.Fardon became managing partner of the firm’s Chicago …