SEATTLE (MCT) — A supervisor in the Seattle office of the federal Bureau of Alcohol, Tobacco, Firearms and Explosives has resigned while under internal investigation over his handling of a paid informant who sexually abused a woman while working for the agency, according to a federal source who has been briefed on the matter.

Special Agent Jim Contreras came under scrutiny after The Seattle Times reported in a May 13 story that the informant he oversaw, Joshua Allan Jackson, had been hired despite a lengthy history of violent behavior toward women and, while working for the agency, engaged in criminal activity that included holding the woman as his prisoner.