Derek Chauvin has been sentenced to 21 more years in prison in the George Floyd murder case

Derek Chauvin, the former Minnesota police officer who killed George Floyd in 2020, was sentenced Thursday to 21 years in prison for violating his civil rights.

Federal Judge Paul Magnuson has blown the disgraced ex-cop off the bench before handing out the hefty sentence, which comes at the same time as the more than 22 years that Chauvin has already been sentenced to murder and manslaughter.

“I really don’t know why you did what you did,” the judge told Chauvin. “Putting your knee on someone’s neck until it expires is just wrong. … Your behavior is wrong and offensive.”

Because of federal parole policy, Chauvin will likely spend more time behind bars than if he were just serving his sentence imposed by the judge in his state case.

The ex-cop is also being transferred from Minnesota’s only maximum-security state prison to a federal prison because of the conviction.

Magnuson also blamed Chauvin for destroying the lives of three fellow cops who were at the scene when he killed Floyd — and who were each convicted of federal crimes.

“You completely wrecked the lives of three young officers by taking command of the crime scene,” the judge said.

Chauvin knelt on Floyd’s neck after forcing him to the ground outside a Minneapolis supermarket on May 25, 2020.

Floyd screamed for his life and for his mother as the officer suffocated him by forcing his knee behind his neck.

The killing, caught on video by bystanders, sparked a wave of racial justice protests and civil unrest around the world.

Chauvin was convicted after a trial in April 2021 in state court. Judge Peter Cahill sentenced him to 22 1/2 years in state prison after the conviction.

With mail wires