The first witness in Derek Chauvin's murder trial, a 911 dispatcher, testified Monday that she alerted a police supervisor May 25 after she watched Minneapolis police officers pin George Floyd to the ground live in a security video.

The dispatcher, Jena Scurry, said it was a "gut instinct" that led her to call a police sergeant who was a supervisor for the officers at the scene. She said she glanced up at wall-mounted dispatch screens between taking other calls and saw a police squad car moving back and forth outside Cup Foods, a convenience store. An employee at Cup Foods had called police alleging that Floyd had tried to pass a counterfeit $20 bill.

Scurry said that her job is primarily to listen and that it is rare for a dispatcher to witness an incident in which police are at a scene. She said she has observed police at a scene only three or four times in her seven-year career.

Scurry said the police officers restrained Floyd for so long that she asked someone whether her "screens had frozen because it hadn't changed" and "was told that it was not frozen."