A masked Derek Chauvin showed no visible emotion as Judge Peter Cahill read the verdict on each count. Cahill said sentencing would be in roughly eight weeks.
Hundreds gathered outside the courthouse to hear the jury's decision.
Family members urged Congress to pass the George Floyd Justice in Policing Act.
Although the darkness still lingers, the sun poked through the clouds on Tuesday.
Hundreds trickled in to hear and celebrate the verdict. Some in the crowd wept and embraced.
The president and vice president called for police reform.
Attorney General Keith Ellison and Hennepin County Attorney Mike Freeman spoke at Hennepin County Government Center.
Jurors face heavy stress in many cases, veteran court officials and trauma experts say, but they are especially vulnerable in high-profile proceedings.
Derek Chauvin was found guilty on all counts in the killing of George Floyd.
Andrew Thomas, 28, is charged with illegal possession of a firearm.
The move comes just as some students are returning to school buildings.
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Minneapolis streets erupt in elation over guilty verdicts for Derek Chauvin in George Floyd's death.
After nearly three weeks of testimony, the defense rested its case Thursday in the murder trial of former Minneapolis police officer Derek Chauvin. Here's a look back at each day's testimony.