Chauvin was reportedly seriously injured from the stabbing at a federal prison on Arizona. Chauvin was convicted of murdering George Floyd in 2020, leading to calls for racial justice in the US that year.

George Floyd died after a police officer knelt on his neck for more than nine minutes while he yelled "I can't breathe." Tou Thao is the fourth and final former police officer to receive a sentence over the killing.

Six Swiss police officers have appeared in court accused of homicide in the case of a 2018 death of a Black man from a heart attack as he was being arrested.

The 2020 murder of George Floyd focused attention on police violence in the United States. Though the officers involved are serving time in prison, efforts to address police racism remain stalled.

Exactly three years ago, George Floyd, a 46-year-old African American, was killed by a White police officer, Derek Chauvin. Floyd's death triggered widespread protests across the United States and around the world, with calls to end police violence and systemic racism. Chauvin was eventually sentenced to more than 22 years in prison, while the city of Minneapolis reached a $27 million settlement with Floyd's family. Three years after Floyd's murder, how much has changed in the US? Our correspondent reports.