Derek Chauvin Murder Trial: What Brits Need To Know About The Case The ex-officer is accused of killing George Floyd by kneeling on his neck last year. Here's what we've learnt and what happens next. Closing arguments at the trial of former police officer Derek Chauvin are set to conclude on Monday. The ex-cop is accused of killing George Floyd last year by kneeling on his neck for nearly nine minutes. Video footage of the incident sparked international Black Lives Matter protests against racism and police brutality in May last year. Chauvin is one of four officers charged in Floyd’s death. The three other former officers, Thomas Lane, J Kueng and Tou Thao, are charged with aiding and abetting.