This was not an intentional murder by any means and I'm surprised the prosecution went for that charge. They had all the information about Floyd's health condition before they pressed charges.
Just to note, the hold down position that Chauvin made couldn't been too restrictive because Floyd could still talk and did so for a few minutes of being held that way.
The cops were probably thinking hey this is big strong guy, he can take this.
The damming evidence in this case is shown by the police's body cam footage when one officer goes to check for a pulse on Floyd's arm and says I dont get a pulse but all the officers there including Chauvin didn't make a motion to turn him over and try to resuscitate him.