A bystander's camera captured the 2020 arrest of George Floyd by officer Derek Chauvin. In the video, Chauvin can be seen pushing his knee into Floyd's neck for nine minutes. Police had been called because Floyd was suspected of using a counterfeit $20 bill.
Demonstrators demanding police reforms and accountability marched in cities across the U.S. Chauvin was fired and indicted for the killing.
After a three-week trial, jurors found Chauvin guilty of second- and third-degree murder and manslaughter, and he is now serving a 22-1/2 year prison sentence.
His attorney's filed an appeal last year alleging the judge made multiple errors, including refusing to move the trial out of Minneapolis and decline to sequester the jurors.
Minnesota's top court rejected the appeal and upheld the conviction, prompting Chauvin to turn to the Supreme Court.
Separately, Chauvin in December 2021 pleaded guilty in federal court to charges that he violated Floyd's civil rights.
Earlier this month Chauvin filed a motion seeking to overturn that conviction based on what he claims is new evidence showing that Floyd's death resulted from an underlying medical condition.