Patricia "Pat" Kerrigan is an inmate who is imprisoned for stabbing her ex-boyfriend, she comes to Larkhall on her own request, her motives are revealed when she takes a nun (Sister Thomas Moore) hostage and reveals the abuse she suffered by the nun and another priest (Father Kelly). Pat becomes enemies with Natalie Buxton and later fights her and wins. Pat becomes the new Top Dog and also becomes infatuated with another inmate who is in for taking drugs, Sheena Williams.