Chicago police Superintendent Garry McCarthy

Chicago police Superintendent Garry McCarthy announces on Nov. 27, 2015, the arrest of Corey Morgan, 27, in the shooting death of 9-year-old Tyshawn Lee.

Chicago police Superintendent Garry McCarthy, right, joined by Mayor Rahm Emanuel, speaks during a news conference regarding the shooting death of Laquan McDonald on Nov. 24, 2015.

Hundreds of protesters rally along North Michigan Avenue on Nov. 27, 2015, to disrupt Black Friday shopping over the October 2014 shooting death of Laquan McDonald by a Chicago police officer.

Mayor Rahm Emanuel, right, and Chicago police Superintendent Garry McCarthy announce a drive for more police recruitment from a diverse sector of Chicago at police headquarters Nov. 2, 2015.

Chicago Mayor Rahm Emanuel and police Superintendent Garry McCarthy announce $250,000 gun buy-back program at Greater Open Door Baptist Church in Chicago on Oct. 19, 2015.

Chicago police Superintendent Garry McCarthy talks to a Chicago Tribune reporter in his office at police headquarters on Sept. 10, 2015.

Chicago police Superintendent Garry McCarthy listens to a call for the firing of Detective Dante Servin on Aug. 20, 2015, at a monthly board meeting at Chicago Police Department headquarters.

Chicago police Superintendent Garry McCarthy displays a Sheriff’s Department sketch Sept. 10, 2015, of what the child found in the Garfield Park lagoon may have looked like at the time of death.

Mayor Rahm Emanuel speaks with police Superintendent Garry McCarthy after a kickoff for “A Summer in Faith and Action,” a citywide violence prevention initiative, at the Garfield Park field house on May 15, 2015.

Police Superintendent Garry McCarthy salutes thousands of police officers as they march in the 83rd annual St. Jude Memorial March in Chicago on May 3, 2015.

Chicago police Superintendent Garry McCarthy adjusts his cap before marching in the St. Patrick’s Day Parade on South Columbus Drive on March 14, 2015, in Chicago.

Mayor Rahm Emanuel watches as Chicago police Superintendent Garry McCarthy presides over police graduation ceremonies on March 30, 2015, at Navy Pier.

Protesters on Feb. 18, 2015, put ashes on posters of Mayor Rahm Emanuel and police Superintendent Garry McCarthy to represent repentance, to demand reform in the Chicago Police Department and to seek an end to police brutality against citizens.

Chicago police Superintendent Garry McCarthy, right, listens to attorney Mike Deno address Judge Timothy Joyce during a sentencing hearing for Toyious Taylor and Paris McGee at the Leighton Criminal Court Building on Feb. 4, 2015. Both were found guilty in the 2010 murder of Officer Thomas Wortham IV.

Chicago police Superintendent Garry McCarthy walks toward the media outside the emergency room at Stroger Hospital on Oct. 7, 2014, after an officer was shot earlier in the Englewood neighborhood.

Chicago police Superintendent Garry McCarthy speaks at the City Club of Chicago luncheon Sept. 3, 2014, at Maggiano’s.

Police Superintendent Garry McCarthy waits to speak at a news conference Aug. 5, 2014, announcing Chicago’s newest public art display, “Horses of Honor.” The fiberglass horses were designed to raise awareness and support for the Chicago Police Memorial Foundation.

Police Superintendent Garry McCarthy leaves a building where an executive of a Loop company shot and killed himself July 31, 2014, after critically wounding the CEO of the firm in a dispute over a demotion.

Chicago police Superintendent Garry McCarthy rides in the 45th annual Pride Parade on June 29, 2014.

Chicago police Superintendent Garry McCarthy is greeted by fellow officers June 11, 2014, as he makes his first public appearance since undergoing an angioplasty to clear two blocked arteries.

Chicago police Superintendent Garry McCarthy, second from left, joins Mayor Rahm Emanuel and a new graduating class for a group photo before graduation June 11, 2014, at Navy Pier.

Chicago police Superintendent Garry McCarthy jokes with Mayor Rahm Emanuel on June 11, 2014, as they pose for group photos before the cadet graduation ceremony at Navy Pier.

U.S. Attorney Gary Shapiro, right, and Chicago police Superintendent Garry McCarthy join local and federal agencies Sept. 26, 2013, in announcing charges against members of the Hobos street gang.

Producer Mark Benjamin, from left, Chicago police Superintendent Garry McCarthy, narrator Mark Konkol and producer Marc Levin pose for photos March 4, 2014, during the preview night at the Bank of America Theatre for the CNN series “Chicagoland” in Chicago.

Edward Stachura, 4, gets a handshake from police Superintendent Garry McCarthy as his mother, Officer Melissa Stachura, receives an award at a monthly commendation ceremony on March 18, 2014.

Police Superintendent Garry McCarthy rides in the Chicago Pride Parade on June 30, 2013.

Chicago police Superintendent Garry McCarthy announces charges against two people in the killing of Hadiya Pendleton, 15, during a news conference on Feb. 11, 2013, at 2nd District headquarters.

Chicago police Superintendent Garry McCarthy on Sept. 24, 2013, announces the arrests of four people charged in a shooting the previous week at Cornell Square Park that injured 13.

Mayor Rahm Emanuel and Chicago police Superintendent Garry McCarthy talk Jan. 16, 2013, during graduation of Chicago Police Department detectives at Navy Pier.

Mayor Rahm Emanuel, flanked by Chicago police Superintendent Garry McCarthy and State’s Attorney Anita Alvarez, announces gun safety legislation on Feb. 11, 2013, to increase minimum sentencing for the most serious gun crimes and require offenders to serve at least 85 percent of their sentence.

Nathaniel Pendleton Jr., from left, brother of slain teen Hadiya Pendleton, is embraced by his father, Nathaniel Pendleton, as his mother, Cleopatra Cowley-Pendleton, weeps during a Jan. 30, 2013, news conference with police Superintendent Garry McCarthy at Harsh Park.

Felicia Davis, from left, of the mayor’s office, police Superintendent Garry McCarthy, Building Commissioner Michael Merchant, CTA President Forrest Claypool and Chicago Public Schools CEO Barbara Byrd-Bennett walk from Ross Elementary to Dulles Elementary on May 3, 2013, to experience the walk students have each day.

Mayor Rahm Emanuel listens to police Superintendent Garry McCarthy speak at a graduation of Chicago Police Department detectives Jan. 16, 2013, at Navy Pier.

Chicago police Superintendent Garry McCarthy, right, Mayor Rahm Emanuel and others look at confiscated guns Jan. 8, 2013, after an announcement of the revitalization of the community policing program.

Chicago police Superintendent Garry McCarthy gets a smile from Naomi Taylor, 9, on Nov. 9, 2012, as a street sign is dedicated in honor of the girl’s father, fallen police Officer Nathaniel Taylor. The officer was fatally shot Sept. 29, 2008, while serving a search warrant.

Mayor Rahm Emanuel and Chicago police Superintendent Garry McCarthy leave Northwestern Memorial Hospital on Nov. 28, 2012, after visiting officers who were injured in an accident on South Side.

Chicago police Superintendent Garry McCarthy addresses the Budget Committee of the Chicago City Council on Oct. 24, 2012.

Police Superintendent Garry McCarthy, left, and Leo Schmitz, commander of the Englewood police district, speak with Englewood resident Perry Moore on Aug. 25, 2012, after McCarthy held a news conference about recent narcotics investigations and violence on the city’s streets.

Chicago police Superintendent Garry McCarthy and his aide leave Advocate Christ Medical Center in Oak Lawn on Aug. 30, 2012, after visiting an officer who was shot and wounded the previous night on the South Side.

Chicago police Superintendent Garry McCarthy hugs the Rev. Michael Pfleger on June 15, 2012, during a peace rally outside St. Sabina Church.

Police Superintendent Garry McCarthy welcomes a new recruit class to the Chicago Police Academy on July 2, 2012.

Police Superintendant Garry McCarthy stands with officers at an Occupy protest on May 21, 2012, at the Prudential Building in Chicago.

Chicago police Superintendent Garry McCarthy, center, meets with officers May 20, 2012, after a clash between police and protesters at the end of an anti-war march and rally during the NATO summit.

Chicago police Superintendent Garry McCarthy assists police during a clash with protesters at Cermak Road and Michigan Avenue on May 20, 2012, after a march during the NATO summit.

Chicago police Superintendent Garry McCarthy greets Occupy protester “Romania,” of Scranton, Pa., at Daley Plaza during demonstrations May 18, 2012, over the NATO summit.

Mayor Rahm Emanuel listens to police Superintendent Garry McCarthy on May 15, 2012, before making an announcement about a new public safety strategy.

Chicago police Superintendent Garry McCarthy speaks as Officer Del Pearson is discharged from Advocate Christ Medical Center on March 27, 2012, after being shot in the line of duty.

Mayor Rahm Emanuel and police Superintendent Garry McCarthy greet the family of police Officer Clifton Lewis during services Jan. 5, 2012, at Missionary Baptist Church. Lewis was killed in the line of duty.

Deputy Superintendent Alfonza Wysinger, from left, Superintendent Garry McCarthy and Cmdr. Walter Green talk before a news conference Dec. 30, 2011, about fallen Officer Clifton Lewis, who was fatally shot the night before while attempting to stop an armed robbery.

Deputy Superintendent Al Wysinger, left, Mayor Rahm Emanuel and Superintendent Garry McCarthy stand with family members of slain Officers Clifton Lewis and Paul Nauden during the St. Jude Police League parade and ceremony May 6, 2012.

Cook County State’s Attorney Anita Alvarez and police Superintendent Garry McCarthy attend a news conference July 27, 2011, at the Leighton Criminal Court Building, where Antwon Carter appeared in bond court in the July 2010 shooting death of police Officer Michael Bailey.

Chicago police Superintendent Garry McCarthy poses in his office Sept. 1, 2011. McCarthy was a police officer in New York City when the Sept. 11 attacks occurred in 2001.

Police Superintendent Garry McCarthy kisses the hand of Pamela Bailey on July 18, 2011, at a memorial in honor of her husband, fallen Officer Michael Bailey, who was killed in the line of duty July 18, 2010.

Lobbyist Billy Glunz, left, with Chicago police Superintendent Garry McCarthy and Tressie McDonough, UIC College Prep principal, as McCarthy testifies for proposed speed camera legislation Oct. 24, 2011, before a Senate committee in Springfield.

Chicago police Superintendent Garry McCarthy, left, announces a reorganization and restructuring of the department’s command positions during a news conference Aug. 8, 2011, at police headquarters. The changes, which simplify the command structure, are expected to save the department more than $1 million.

Police Superintendent Garry McCarthy waits on a CTA platform Nov. 21, 2011, for the arrival of Mayor Rahm Emanuel and CTA President Forrest Claypool to announce that the project to install security cameras at “L” stops across the city has been completed six weeks ahead of schedule.

Chicago police Superintendent Garry McCarthy laughs during an interview May 30, 2011.

Chicago Mayor-elect Rahm Emanuel, left, announces the appointment of Garry McCarthy, second from left, as police superintendent on March 23, 2011.

Departing Newark, N.J., police Director Garry McCarthy appears at a news conference May 9, 2011, to announce a Justice Department investigation into civil rights violations by the department.