A “superstar” veteran prosecutor who helped secure convictions and prison sentences for former Illinois House Speaker Michael J. Madigan and ex-Chicago Ald. Edward M. Burke is leaving the U.S. attorney’s office by the end of the year.

Assistant U.S. Attorney Sarah Streicker began working as a prosecutor there in 2010 and will be leaving in the coming weeks. That’s according to Joseph Fitzpatrick, spokesman for U.S. Attorney Andrew Boutros.

Streicker leaves as the head of the office’s Public Corruption and Organized Crime Section. She took on that role in March, following the departure of Amarjeet Bhachu, the previous head of that section. Bhachu also played a key role in the investigation of Madigan and Burke.

Streicker declined to comment through Fitzpatrick. But Megan Church, a onetim

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