He was convicted of 2nd degree unintentional murder. Which, in Minnesota, one of the definitions is that you killed someone while committing a felony. So even

He was convicted of 2nd degree unintentional murder. Which, in Minnesota, one of the definitions is that you killed someone while committing a felony. So even if fully an accident, if you kill someone while robbing a store, that's going to be 2nd degree murder. And in the case of this trial, I assume the jury was simply convinced that kneeling on someone's neck for nearly 10 minutes while they beg for mercy and then continuing to apply pressure for minutes after they pass out is a crime in and of itself, even if he had not died.