Carl Denti, an FBI field agent, inherited his partner Fred Duncan’s caseload after Duncan’s mysterious death. Duncan had been involved with Professor Charles Xavier’s mutant underground. Frustrated by mutants escaping legal consequences, Denti became the X-Cutioner, using confiscated weapons to punish mutants without convictions. He clashed with the X-Men during an assassination attempt on mutant criminal Tower. Denti also targeted mutants Nate Grey, Rogue, and Skin. In Washington, D.C., he assisted the Punisher in protecting pro-mutant activist Reverend Conover from a group unrelated to the Mutant Liberation Front. Despite being considered for the Initiative, Denti continued his anti-mutant campaign with the organization Homines Verendi after the Civil War. If you have any more questions or need further details, feel free to ask!