I watched the Crowder “interview”, if you wish to call it that . There was a period of time where the two pursuers would not have been able to observer nor hear the perp shooting himself and I don’t doubt an ME stating the fatal shot was self-inflicted.
Willeford didn’t claim to have killed the perp, just that he aimed at the gap in his body armor.
He said the perp didn’t move at the end of the chase.