Distressing and at times tearful testimony by young eyewitnesses dominated the murder trial of former Minneapolis police officer Derek Chauvin on Tuesday, including that of the teen girl whose video of George Floyd’s arrest set off nationwide protests.

Witnesses spoke about Floyd’s apparent inability to breathe, and several said that police did not check for his pulse. Chauvin’s defense attorney, Eric Nelson, did not cross-examine all the young witnesses, but did focus on one of the teenagers as he tried to raise what he called inconsistencies in her courtroom testimony and statements made to investigators last year.

Perhaps the most powerful testimony of the day came from Darnella Frazier, who was 17 when she filmed the cellphone video of Floyd’s arrest that ultimately went viral and prompted a tidal wave of public outrage. She testified that the video changed her life and said she regrets not physically intervening to help Floyd.