ST. PAUL, Minn. - Three community groups delivered more than 7,000 signatures to the office of Ramsey County Attorney John Choi on Monday calling for a "true independent prosecutor" to handle the Philando Castile case.

Representatives from Neighborhoods Organizing for Change, the ACLU of Minnesota and the Minneapolis NAACP delivered the petition asking for an independent special prosecutor to handle the investigation into the officer-involved shooting death of Philando Castile.

Last week, Choi announced his decision to bring on Don Lewis to assist in the investigation. Lewis is a civil rights attorney and former assistant U.S. Attorney for Minnesota. Choi added that he would not completely turn over the case to Lewis.

Shortly thereafter, the groups announced their disagreement with the appointment, saying Lewis' role in the case will not be that of a "true independent special prosecutor."

"Unfortunately, Don Lewis has a track record of doing the bidding of law enforcement and government agencies," Minneapolis NAACP President Nekima Levy-Pounds said Monday. "We want an independent special investigation to bring about more trust in the justice system, which right now is at an all-time low."

Castile, 32, died after being shot by St. Anthony police officer Jeronimo Yanez after a traffic stop in Falcon Heights on July 6.