Jury selection is about to start in the trial of Derek Chauvin, the police officer accused of killing George Floyd. Onlookers in the US city of Minneapolis recorded Chauvin - who's white - kneeling on the neck of Floyd, who was black. The incident sparked protests in the US and across the world against police brutality and racism. What happened to George Floyd? The 46-year-old bought a pack of cigarettes at a convenience store in South Minneapolis on the evening of 25 May 2020. A shop assistant believed he used a counterfeit $20 bill and called the police after Mr Floyd refused to give the cigarettes back. Officers arrived and handcuffed him, but when they tried to put him into the squad car he resisted, and a struggle ended with Mr Floyd face-down on the street. That's when onlookers began filming. Mr Chauvin, 44, placed his left knee between Mr Floyd's head and neck, and kept it there for seven minutes and 46 seconds, according to prosecutors. Two other officers helped pin him down, while another prevented witnesses from intervening. More than 20 times Mr Floyd said he could not breathe. The video shows him go limp and get carried away by police. When is the George Floyd trial? The weeks-long process will begin on Monday 8 March with jury selection. Arguments are due to start on 29 March and are expected to take at least one month. The contentious process will see lawyers for both sides question dozens - or possibly hundreds of candidates - and eventually choose 16 people. Twelve jurors will be seated to decide the case, with four other alternates chosen as backups. Potential jurors have already submitted questionnaires, describing their existing knowledge of the case, any previous contact with police and their media habits. Each side can remove a potential juror from the panel, but if either side believes a juror has been relieved due to discrimination based on race, ethnicity or sex, opposing lawyers can issue a "Batson challenge". The judge then decides whether the juror stays or goes. How did the US react to Floyd's death? The four police officers at the scene were fired the following day as crowds took to the streets of Minneapolis to protest. The station where they worked was set ablaze and protests quickly spread to other cities. By the sixth night, there were protests in 75 cities across the US - some violent - and a national debate about police brutality against African-Americans was reignited. An anti-racism movement created in 2013 after the killing of teenager Trayvon Martin, Black Lives Matter, was re-energised by the protests. Even very white, small towns in rural parts of the US held protests to remember Mr Floyd and take a stand against racial injustice. Reforms were introduced by lawmakers to change the way some police forces make arrests and detain suspects. But the conversation soon widened from policing to issues such as workplace equality, unconscious bias and the legacy of slavery.