Fotis Dulos' former attorney may testify against the accused killer's former mistress. Michelle Troconis and former attorney Ken Mawhinney are co-defendants in the disappearance of Jennifer Dulos. Troconis, who was Fotis Dulos’ live-in girlfriend when Jennifer disappeared in May 2019, pleaded not guilty to the charges against her. Mawhinney, who appeared virtually in court on Tuesday, is facing a conspiracy charge. He, too, pleaded not guilty.Joining Nancy Grace today:Randy Kessler - Atlanta Trial Lawyer, Emory Law School Professor, Past Chair ABA Family Law Section, Author: "Divorce, Protect Yourself, Your Kids and Your Future", www.KSFamilyLaw.com, Instagram: @rkessler23, Twitter: @GADivorce,Dr. Angela Arnold - Psychiatrist, Atlanta Ga www.angelaarnoldmd.com Joe Scott Morgan - Professor of Forensics Jacksonville State University, Author, "Blood Beneath My Feet" featured on "Poisonous Liaisons" on True Crime Network Laura Ingle - Fox News Senior Correspondent, Host of "Murder in Connecticut: The Jennifer Dulos Story" on Fox Nation, @lauraingletv