Derek Chauvin, police officer accused in George Floyd's death, charged with 3rd-degree murder

The police officer who was seen on video kneeling on the neck of George Floyd, a handcuffed black man who died in custody after pleading that he could not breathe, was arrested Friday and charged with murder in a case that sparked protests across the United States and violence in Minneapolis.

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Hennepin County Attorney Mike Freeman said Derek Chauvin was charged with third-degree murder and manslaughter. Freeman did not provide immediate details, but said a criminal complaint would be made available later Friday and that more charges were possible.

Derek Chauvin was charged with third-degree murder and manslaughter in the death of George Floyd.

In the video, Chauvin is seen kneeling on Floyd's neck as Floyd is on the ground. He gradually becomes motionless as Chauvin and three other officers ignore bystanders' shouts to get off him. Freeman said the investigation continues into the other three officers, but that authorities "felt it appropriate to focus on the most dangerous perpetrator."

Freeman highlighted the "extraordinary speed" in charging the case just four days after Floyd's death, but also defended himself against questions about why it did not happen sooner. He said his office needed time to put together evidence, including what he called the "horrible" video by a bystander. He said he would not bring a case unless he had enough evidence to prove the charges beyond a reasonable doubt.

Protests in Minneapolis escalated in violence on Thursday, when demonstrators torched a police station that officers had abandoned.

"I'm not insensitive to what happened in the streets," Freeman said. "My own home has been picketed regularly."

All four officers who were at the scene of Floyd's death were fired the next day. After the charges were announced, protesters outside the government center chanted, "All four got to go."

News of the arrest came moments after Minnesota Gov. Tim Walz acknowledged the "abject failure" of the response to the protests and called for swift justice for officers involved. Walz said the state would take over the response to the violence and that it's time to show respect and dignity to those who are suffering.

"Minneapolis and St. Paul are on fire. The fire is still smoldering in our streets. The ashes are symbolic of decades and generations of pain, of anguish unheard," Walz said, adding. "Now generations of pain is manifesting itself in front of the world - and the world is watching."

The governor cited a call he received from a state senator who described her district "on fire, no police, no firefighters, no social control, constituents locked in houses wondering what they were going to do. That is an abject failure that cannot happen."

His comments came the morning after protesters torched a police station that officers abandoned during a third night of violence. Livestream video showed protesters entering the building, where intentionally set fires activated smoke alarms and sprinklers. President Donald Trump threatened action, tweeting "when the looting starts, the shooting starts," which prompted a warning from Twitter for "glorifying violence."

VIDEO: 'Firing them is not enough," George Floyd's sister

Bridgett Floyd, sister of George Floyd, a black man who died in police custody, said firing the Minneapolis officers involved "is just not enough."

Other noteworthy stories related to George Floyd's death and its aftermath:

VIDEO: CNN reporter arrested on live TV covering George Floyd protests

CNN reporter Omar Jiminez is arrested by the Minnesota State Patrol in Minneapolis on live TV while reporting on the aftermath of the protests.

The Associated Press contributed to this report.