More coverage: The Dante Servin case

Janae Bonsu, center left, and Page May, center right, hold each other during an April 21, 2015, rally at the Daley Center over the acquittal a day earlier of a Chicago police detective in the fatal shooting of Rekia Boyd.

Defense attorney Jennifer Blagg addresses the court as Chicago police Detective Dante Servin listens during the third day of his trial at the Leighton Criminal Court Building in Chicago on April 16, 2015.

Former Chicago cop Dante Servin, center, who shot and killed Rekia Boyd, walks into the courtroom at Leighton Criminal Courthouse to have his criminal charges expunged, Nov. 14, 2019.

Martinez Sutton speaks about his sister, Rekia Boyd, after former Chicago police Detective Dante Servin appeared before the court on Nov. 19, 2019, at the Leighton Criminal Courts Building.

Defense attorney Jennifer Blagg mimics the aim of a gun during opening statements April 9, 2015, in the trial of Chicago police Detective Dante Servin.

A small group of activists holds a rally at the Daley Center on April 21, 2015, over the verdict in the killing of Rekia Boyd. Chicago police Detective Dante Servin was acquitted by a judge a day earlier on a legal distinction.

People light candles to begin a vigil for Rekia Boyd on the campus of DePaul University in Chicago on May 12, 2015.

A vigil is held for Rekia Boyd on the campus of DePaul University in Chicago on May 12, 2015.

Martinez Sutton speaks during a vigil for his sister Rekia Boyd on the campus of DePaul University in Chicago on May 12, 2015.

DePaul University students Tatiana Delgado, left, and Venezia Rodriguez attend a vigil for Rekia Boyd on the school's Lincoln Park campus in Chicago on May 12, 2015.

Chicago police Detective Dante Servin listens as Judge Dennis Porter reads the decision in his manslaughter case April 20, 2015. The defense asked the judge for a directed verdict. The judge found Servin not guilty on all counts in the shooting death of Rekia Boyd.

Ikca Beamon describes the size of the bullet hole she saw in the head of her friend Rekia Boyd during testimony in the trial of Chicago police Detective Dante Servin at the Leighton Criminal Court Building on April 9, 2015. Servin is charged with manslaughter in Boyd's death.

Chicago police Detective Dante Servin, center, answers reporters' questions after being found not guilty April 20, 2015, in the March 2012 shooting death of Rekia Boyd.

Donald Lightfoot holds a sign in support of Rekia Boyd on April 20, 2015, while joining other protesters in the 1500 block of South Albany Avenue in Chicago.

A protester stands between a police squad car and a police bicyclist during a march on the West Side in April 2015 after Chicago police Detective Dante Servin was found not guilty of manslaughter.

Former Chicago police Detective Dante Servin leaves court after a judge declined to expunge his court records, Nov. 19, 2019 at the Leighton Criminal Courts Building.

Cook County Medical Examiner Stephen Cina points to the area where a bullet entered the head of gunshot victim Rekia Boyd during his testimony in the trial of Chicago police Detective Dante Servin on April 9, 2015.

Judge Dennis Porter, left, watches as Chicago police Detective Ed Heerdt testifies during the third day of fellow detective Dante Servin's trial at the Leighton Criminal Court Building in Chicago on April 16, 2015.

Chicago police Detective Dante Servin, wearing sunglasses, exits the Leighton Criminal Court Building on April 20, 2015, after being found not guilty in the shooting death of Rekia Boyd.

Witness Antonio Cross mimics the way Chicago police Detective Dante Servin shot his gun in March 2012, striking and killing Rekia Boyd. Servin, on trial at the Leighton Criminal Court Building on April 13, 2015, is charged with manslaughter in Boyd's death.

Judge Dennis Porter asks defendant Dante Servin if he clearly understands his decision to waive a jury trial and instead opt for a bench trial, at the start of Servin's trial on manslaughter charges for the March 2012 shooting death of Rekia Boyd.

A small group of protesters marches on 15th Place near Kedzie Avenue in Chicago on April 20, 2015, after a Cook County judge threw out all charges against veteran Chicago police Detective Dante Servin in the shooting death of Rekia Boyd.

Martinez Sutton is emotional as he speaks about his sister, Rekia Boyd, after former Chicago police Detective Dante Servin appeared before the court on Nov. 19, 2019, at the Leighton Criminal Courts Building.

Chicago police Detective Dante Servin, left, listens to his attorney Darren O'Brien during the second day of his trial at the Leighton Criminal Court Building on April 13, 2015. Servin is on trial for manslaughter in the March 2012 shooting death of Rekia Boyd.

A small group of protesters marches April 20, 2015, after a Cook County judge threw out all the charges against veteran Chicago police Detective Dante Servin, who was on trial for fatally shooting Rekia Boyd.

Flowers are left on the sidewalk following a vigil for Rekia Boyd on May 12, 2015.

Chicago police Detective Dante Servin, right, attends the second day of his trial at the Leighton Criminal Court Building on April 13, 2015. Servin is on trial for manslaughter in the March 2012 shooting death of Rekia Boyd.

A protester hits a police car with a garden Tiki torch at Roosevelt Road and California Avenue in Chicago on April 20, 2015. Earlier in the day, Chicago police Detective Dante Servin was found not guilty on manslaughter charges in the 2012 death of Rekia Boyd.

Ikca Beamon, right, points to where she hid when her friend Rekia Boyd was shot, during testimony in the trial of Chicago police Detective Dante Servin. Servin is charged with manslaughter in the March 2012 shooting death of Boyd.

Martinez Sutton, brother of Rekia Boyd and supporters, hold a news conference outside City Hall, denouncing former Chicago cop Dante Servin getting a pension and his bid to have his criminal charges expunged, Nov. 14, 2019.

Family and supporters of Rekia Boyd hold hands in prayer while Dante Servin's attorney speaks to the media on Nov. 19, 2019, at the Leighton Criminal Courts Building.

Chicago police Officer Partiece Walker points to police Detective Dante Servin while testifying at Servin's trial April 9, 2015, at the Leighton Criminal Court Building. Servin is charged in the March 2012 fatal shooting of Rekia Boyd.

Chicago police Detective Dante Servin, wearing sunglasses, exits the courthouse April 20, 2015, after being found not guilty in the March 2012 shooting death of Rekia Boyd.

Judge Dennis Porter listens to attorneys on day three of the trial of Chicago police Detective Dante Servin at the Leighton Criminal Court Building in Chicago on April 16, 2015,

Chicago police Detective Dante Servin, right, listens as his attorney Darren O'Brien talks with prosecuting attorneys April 9, 2015, during his trial in Chicago on manslaughter charges in the March 2012 fatal shooting of Rekia Boyd.

Judge Dennis Porter explains the four elements of finding a defendant guilty on manslaughter charges on April 20, 2015, while stating his decision in the trial of Chicago police Detective Dante Servin, charged in the March 2012 shooting death of Rekia Boyd. The defense asked the judge for a directed verdict after the prosecution finished making its case. Porter found Servin not guilty on all counts.

Chicago police Detective Dante Servin, right, whispers to his attorney Darren O'Brien during the third day of his trial at the Leighton Criminal Court Building in Chicago on April 16, 2015. Servin is charged with manslaughter in the March 2012 shooting death of Rekia Boyd.

Chicago police forensic investigator Carl Brasic talks about the bullet he collected as evidence at the crime scene where Chicago police Detective Dante Servin shot and killed Rekia Boyd in March 2012.

Martinez Sutton weeps while testifying April 9, 2015, at the trial of Chicago police Detective Dante Servin on manslaughter charges. Rekia Boyd, Sutton's sister, was fatally shot by Servin in March 2012.

Chicago police Detective Dante Servin attends the third day of his trial in the March 2012 shooting death of Rekia Boyd at the Leighton Criminal Court Building on April 16, 2015, in Chicago.

Chicago police Detective Ed Heerdt mimics the actions that Detective Dante Servin took, as described to Heerdt during his investigation of the March 2012 shooting death of Rekia Boyd.