One of three Minneapolis police officers charged with federal civil rights violations in George Floyd’s killing, which triggered global protests and a re-examination of racism and policing in the United States, took the stand on Wednesday at their trial.

J Alexander Kueng is the second of the former officers to testify.

Kueng, Thomas Lane, and Tou Thao are charged with violating Floyd’s constitutional rights when Officer Derek Chauvin pressed his knee into Floyd’s neck for more than nine minutes as the 46-year-old Black man was handcuffed, face down on the street.