Kathleen Hudak was a sheriff's deputy in Hibbing, Minnesota.
When Sam went missing, she helped Dean search for him despite him lying to her about being a cop, as she empathized with Dean's plight as her own brother Riley had disappeared a few years before. She and Dean eventually found out where and who had Sam. Upon finding Sam about to be killed, they discovered that the kidnappers were not only regular humans, but were also the ones who had kidnapped and killed Kathleen's brother. She shot one kidnapper and arrested the others but, despite having closure, admitted that things didn't feel easier now that she knew what had happened to her brother. She did let Dean go, but made him walk back.