By Eric Levenson and Aaron Cooper, CNN

(CNN) -- The former Minneapolis Police officer who kneeled on George Floyd's neck for over 9 minutes last year was found guilty Tuesday of all three charges against him in one of the most consequential trials of the Black Lives Matter era.

Derek Chauvin, 45, was convicted on charges of second-degree unintentional murder, third-degree murder and second-degree manslaughter. The jury deliberated for more than 10 hours over two days in coming to their decision.

Chauvin, wearing a mask inside the Hennepin County Courthouse in Minneapolis, had no apparent reaction to the guilty verdict. Afterward, his bail was revoked and he was placed in handcuffs and removed from the court through a side door.

The second-degree murder charge said Chauvin assaulted Floyd with his knee, which unintentionally caused Floyd's death. The third-degree murder charge said Chauvin acted with a "depraved mind," and the manslaughter charge said his "culpable negligence" caused Floyd's death.

Chauvin could face up to 40 years in prison for second-degree murder, up to 25 years for third-degree murder and up to 10 years for manslaughter. However, Minnesota's sentencing guidelines recommend about 12.5 years in prison for each murder charge and about four years for the manslaughter charge. His sentencing is set for eight weeks from now.

The verdict comes about 11 months after excruciating bystander video showed Chauvin impassively kneeling on the neck and back of Floyd, handcuffed and lying prone on the street, for 9 minutes and 29 seconds on May 25, 2020. Under the officer's knees, the 46-year-old Black man gasped for air, repeatedly exclaimed "I can't breathe" and ultimately went silent.

His final moments illustrated in clear visuals what Black Americans have long said about the ways that the criminal justice system dehumanizes Black people, setting off mass protests across the country as well as incidents of looting and unrest.

Over about three weeks of testimony in court, Minnesota prosecutors have repeatedly told jurors to "believe your eyes" and rely on that video.

"This case is exactly what you thought when you saw it first, when you saw that video. It is exactly that. You can believe your eyes," prosecuting attorney Steve Schleicher said in closing arguments. "This wasn't policing. This was murder."

The guilty verdicts led to cries of joy among those gathered in Minneapolis at the spot where Floyd took his final breath. Floyd family attorney Ben Crump and the Floyd family released a statement praising the verdicts.

"Painfully earned justice has arrived for George Floyd's family and the community here in Minneapolis, but today's verdict goes far beyond this city and has significant implications for the country and even the world," Crump said in a statement. "Justice for Black America is justice for all of America. This case is a turning point in American history for accountability of law enforcement and sends a clear message we hope is heard clearly in every city and every state."

The defense called seven witnesses of its own -- but not Chauvin himself, as he invoked his Fifth Amendment right not to testify.

Defense attorney Eric Nelson argued that Chauvin's use of force was unattractive but appropriate and said he was distracted by a crowd of hostile bystanders on the scene. He also argued that Floyd died due to fentanyl and methamphetamine use, his resistance of officers and his underlying heart problems, rather than due to Chauvin's actions.

A nation waits on edge

In a first for Minnesota, the trial has been broadcast live in its entirety to accommodate Covid-19 attendance restrictions, giving the public a rare look into the heart of the legal system.

Though the trial has focused specifically on Chauvin and Floyd, the stakes of the case were made clear last week when a police officer in nearby Brooklyn Center was charged with manslaughter after she fatally shot a 20-year-old Black man during a traffic stop.

Tensions are high throughout the Twin Cities region, and authorities have ramped up security in anticipation of a verdict. The Hennepin County Government Center has been surrounded by fencing and barricades since jury selection began in March.

More than 3,000 Minnesota National Guard members have also been activated in the Twin Cities, while businesses in Minneapolis have boarded up windows.

President Joe Biden on Tuesday said he is praying for the "right" verdict in the case, noting that the evidence is, in his view, "overwhelming." He also said he spoke with Floyd's family on Monday.

"They're a good family, and they're calling for peace and tranquility, no matter what that verdict is," he told reporters in the Oval Office.

Prosecutor says trial is 'pro-police'

In the prosecution's first phase of the trial, video from the scene and bystanders' testimony revealed Floyd gasping for air and saying "I can't breathe" 27 times under Chauvin's restraint. Next, a series of police supervisors and use-of-force experts -- including Minneapolis Police Chief Medaria Arradondo -- criticized Chauvin's continued kneeling as excessive and unreasonable, particularly after Floyd had passed out, stopped breathing and had no pulse.

Finally, five separate medical experts explained that Floyd died from a lack of oxygen when Chauvin restricted his ability to breathe in what's known as "positional asphyxia."

In the state's closing argument, Schleicher said Chauvin kneeled on Floyd for so long because of his pride and his ego in the face of concerned bystanders.

"He was not going to let these bystanders tell him what to do. He was going to do what he wanted, how he wanted, for as long as he wanted. And there was nothing, nothing they can do about it because he had the authority. He had the power, and the other officers, the bystanders were powerless," he said. "He was trying to win, and George Floyd paid for it with his life."

He contrasted Chauvin's "ego-based pride" with the proper feelings of pride in wearing a police badge and praised policing as a noble profession. He insisted the state was prosecuting Chauvin individually -- not policing in general.

"This is not an anti-police prosecution; it is a pro-police prosecution," he said. "There is nothing worse for good police than bad police."

In response, Nelson said Chauvin acted as a "reasonable officer" would in that situation and said there was no evidence he intentionally or purposefully used force that was unlawful.

"You have to look at it from the reasonable police officer standard. You have to take into account that officers are human beings, capable of making mistakes in highly stressful situations," Nelson said. "In this case, the totality of the circumstances that were known to a reasonable police officer in the precise moment the force was used demonstrates that this was an authorized use of force, as unattractive as it may be. This is reasonable doubt."

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