As a federal prosecutor, Adam Deitch investigated Norfolk County authorities over their controversial handling of the Karen Read case. Now, he’s running to replace the longtime district attorney who put Read on trial for murder.

Deitch, 42, touted his experience “putting a microscope to entrenched institutions” and pledged to build accountability and integrity in an office beset by public outcry over a string of recent controversies.

The former assistant U.S. Attorney once focused on corruption cases across Massachusetts, prosecuting former State Police troopers involved in the commercial driver’s license scandal and local activist Monica Cannon-Grant for defrauding donors to her nonprofit. Deitch stepped down from his post Nov. 7 to run for Norfolk County District Attorney Michael M

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