[crying] >> reporter: katy bryant shaken as she describes her final conversation with her son daunte wright. bryant was the first witness called in a manslaughter trial of former police officer kim potter. potter is accused of shooting and killing wright after she says she mistakenly pulled her gun instead of her taser. >> he called me to tell me he's been pulled over. he asked, you know, if he was in trouble and he just sounded really nervous. but i reassured him it would be okay. >> reporter: but what bryant heard next still haunts her. >> i could hear the phone being put down and i heard them say, somebody tell somebody to hang up the phone and then that's all i heard. >> reporter: on the stand, bryant revealing what she saw on facetime. >> she said that they shot him. [crying] and she faced the phone towards the driver's seat and my son was