Derek Chauvin pinned his knee on George Floyd's neck for what prosecutors say was 9 minutes, 29 seconds, as a handcuffed Floyd lay face-down on the pavement.
Prosecutors used Martin to help layout the sequence of events leading to the arrest, and also played store security footage showing Floyd in Cup Foods for about 10 minutes, adding to the mountain of video documenting what happened. He said a manager asked another employee to call the police after Floyd and a passenger in Floyd's vehicle twice refused to go back into the store to resolve the issue.
Martin went outside as people were gathering on the curb and yelling at officers, then called his mother, who lived in an apartment upstairs, and told her to stay inside before he took out his phone and began recording. On Tuesday, a parade of witnesses testified that they and other bystanders became upset as they repeatedly begged Chauvin to take his knee off Floyd's neck, but Chauvin refused to ease up, and Thao forced back those on the sidewalk who tried to intervene.One of those who happened upon the scene, Minneapolis firefighter Genevieve Hansen, wept as she recalled being prevented from using her EMT training to help Floyd.