First of all he should be in custody as an accomplice. And nobody in LE thought to keep tabs on him? He’ll probably, conveniently, turn up suicided.
Now, now, now. Stay in your lane or you’ll invoke the ire of the “lifelong law enforcement officers” with which FR has been graced who will FReepsplain to you how not arresting known accomplices and associates and taking them in for questioning is standard operating procedure.