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In this image from video, Dr. Martin Tobin testifies as Hennepin County Judge Peter Cahill presides Thursday, April 8, 2021, in the trial of former Minneapolis police Officer Derek Chauvin at the Hennepin County Courthouse in Minneapolis, Minn. (Court TV via AP, Pool)

George Floyd died of a lack of oxygen from being pinned to the pavement with a knee on his neck, medical experts testified at former Officer Derek Chauvin’s murder trial Thursday, emphatically rejecting the defense theory that Floyd’s drug use and underlying health problems killed him.

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President Joe Biden speaks about gun violence prevention in the Rose Garden at the White House, Thursday, April 8, 2021, in Washington. (AP Photo / Andrew Harnik)

President Joe Biden, in his first gun control measures since taking office, announced a half-dozen executive actions Thursday aimed at addressing a proliferation of gun violence across the nation that he called an “epidemic and an international embarrassment.” 

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A vigil for Adam Toledo, the 13-year-old boy fatally shot by police on March 29, takes place in Little Village on Monday, April 5. (WTTW News)

Chicago police have yet to release footage of the March 29 police shooting of 13-year-old Adam Toledo, but his death has spurred calls for changes to the Chicago Police Department’s policy on foot pursuits like the one during which Toledo was shot. We get reaction from the Fraternal Order of Police.

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In this Jan. 31, 2019 file photo, pedestrians walk near a Northeastern University sign on the school’s campus in Boston. (AP Photo / Rodrique Ngowi, File)

Steve Waithe, 28, of Chicago, is accused of creating fake social media accounts to contact track and field athletes and offering to help get rid of compromising photos of them he claimed to have found online. 

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In this image from video, witness Jody Stiger, a Los Angeles Police Department sergeant testifies as Hennepin County Judge Peter Cahill presides Wednesday, April 7, 2021, in the trial of former Minneapolis police Officer Derek Chauvin at the Hennepin County Courthouse in Minneapolis. (Court TV via AP, Pool)

Officer Derek Chauvin had his knee on George Floyd’s  neck — and was bearing down with most of his weight — the entire 9 1/2 minutes the Black man lay facedown with his hands cuffed behind his back, a use-of-force expert testified Wednesday at Chauvin’s murder trial. 

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A file photo shows a crime scene blocked off by the Chicago Police Department. (WTTW News)

A 21-month-old boy was shot in the head Tuesday morning while riding in a car on Chicago’s famed Lake Shore Drive just hours after seven people were shot and wounded in a fight a few miles away, in what is shaping up to be one of the most violent years for the city in memory, police said. 

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In this image from video, Minneapolis Police Lt. Johnny Mercil, a use of force trainer, testifies as Hennepin County Judge Peter Cahill presides Tuesday, April 6, 2021, in the trial of former Minneapolis police Officer Derek Chauvin at the Hennepin County Courthouse in Minneapolis. (Court TV via AP, Pool)

Minneapolis police are taught to restrain combative suspects with a knee on their back or shoulders if necessary but are told to “stay away from the neck when possible,” a department use-of-force instructor testified Tuesday at former Officer Derek Chauvin’s murder trial.

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(WTTW News)

Police say a 21-month-old child remains hospitalized in critical condition following the shooting Tuesday morning near Grant Park. One person is currently being questioned in relation to the shooting.

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(WTTW News)

The agency that investigates Chicago police shootings will release body camera video of an officer fatally shooting a 13-year-old boy, first to the boy’s family and then to the public, an official said Friday.

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(WTTW News)

It’s been a violent start to 2021 in Chicago, which has recorded 131 homicides in the first three months of the year. Now, a measure sitting on Gov. J.B. Pritzker’s desk declares violence a public health crisis and takes aim at racial inequities in the state’s health care system.

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In this image from video, witness Minneapolis Police Chief Medaria Arradondo testifies as Hennepin County Judge Peter Cahill presides Monday, April 5, 2021, in the trial of former Minneapolis police Officer Derek Chauvin at the Hennepin County Courthouse in Minneapolis. (Court TV via AP, Pool)

The Minneapolis police chief testified Monday that now-fired Officer Derek Chauvin violated departmental policy — and went against “our principles and the values that we have” — in pressing his knee on George Floyd’s neck and keeping him down after Floyd had stopped resisting and was in distress.

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Mayor Lori Lightfoot speaks at the New Life Church on Monday, April 5, 2021. (WTTW News)

Mayor Lori Lightfoot says a new policy on foot pursuits must be put in place for the Chicago Police Department by this summer following the fatal shooting of Adam Toledo, one week after the boy was killed by a police officer in an alley on the Southwest Side.

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Charles McMillian becomes emotional as he answers questions at the trial of former Minneapolis police Officer Derek Chauvin in the Hennepin County Courthouse in Minneapolis, Minn. Chauvin is charged in the May 25, 2020 death of George Floyd. (Court TV via AP, Pool, File)

The televised trial of Derek Chauvin, the former white police officer charged in the death of George Floyd, has provoked strong emotions among many Black men and women — all tinged with an underlying dread that it could yield yet another devastating disappointment. 

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(WTTW News)

Another attack at the U.S. Capitol. Questions surround the police shooting of a 13-year-old boy. Mixed signals on Chicago police reform. And the mayor warns of a COVID-19 “quantum leap” in the last week.

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U.S. Capitol Police officers stand near a car that crashed into a barrier on Capitol Hill in Washington, Friday, April 2, 2021. (AP Photo / J. Scott Applewhite)

A Capitol Police officer was killed Friday after a man rammed a car into two officers at a barricade outside the U.S. Capitol and then emerged wielding a knife.

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Black Lives Matter flags fly and line the fence surrounding the Hennepin County Government Center Friday, April 2, 2021 in Minneapolis where the trial for former Minneapolis police officer Derek Chauvin continues. (AP Photo / Jim Mone)

Kneeling on George Floyd’s neck while he was handcuffed and lying on his stomach was top-tier, deadly force and “totally unnecessary,” the head of the Minneapolis Police Department’s homicide division testified Friday.