I’ve been suggesting that for a while - the Mexican government should indict him on several hundred counts of Manslaughter or Negligent Homicide (or the Mexican equivalent thereof) and send in an extradition request.
Google Santiago Creel. He’s a Mexican politician and seems a fairly good guy. He’s begun an effort to hold the US accountable for F&F and Holder specifically. I believe it is largely a campaign ploy but if it works to get Holder, it works for me.