George Floyd, 46, died after being arrested by police outside a shop in Minneapolis, Minnesota.
Footage of the arrest on 25 May shows a white police officer, Derek Chauvin, kneeling on Mr Floyd's neck while he was pinned to the floor.
The transcripts of bodycam footage from officers Lane and J Alexander Kueng show Mr Floyd said more than 20 times he could not breathe as he was restrained. He was also pleading for his mother and begging "please, please, please".
At one point, Mr Floyd gasps: "You're going to kill me, man."
Officer Chauvin replies: "Then stop talking, stop yelling. It takes heck of a lot of oxygen to talk."
Mr Floyd says: "Can't believe this, man. Mom, love you. Love you. Tell my kids I love them. I'm dead."
8 minutes and 46 seconds