Lawrence Byrne, most recently the chief legal officer of the New York Police Department, has rejoined investigations firm Freeh Group International Solutions.

Byrne was deputy police commissioner for the past four years, managing about 100 lawyers in the NYPD’s legal bureau. He oversaw legislative affairs, litigation, policy, and labor and employment issues. He was a liaison for the department in several investigations, including those tied to Eric Garner, who died at the hands of an NYPD officer who held him in a choke hold, and another investigation tied to deputy inspector Jimmy Grant, now on trial for bribery charges.