Michael Jackson 's infamous criminal trial is back in the spotlight thanks to a new Netflix documentary ... and it's apparently stirred up some strong feelings among die-hard MJ fans, who are allegedly threatening one of the trial's central figures. Ron Zonen , the lead prosecutor in Michael's 2005 trial, joined "TMZ Live" Tuesday and told us he's received a handful of threats since appearing in the new Netflix doc, "Michael Jackson: The Verdict." Ron says the threats are coming in over email ..