Okay, I HAD to come over here and mention this; the timing is especially ironic, since I just read this story of yours today. I'm reading the Supernatural tie-in novel "Nevermore", and there's one point where Sam and Dean are being helped out by a New York cop who's telling them about an underground network of cops who are sympathetic to Hunters. And she lists them, including "... a woman in Chicago named Murphy."

... sneaky tie-in writer, very sneaky! So, see? If it's not canon, it's the next best thing! *grin*