 Stan Liddy was a corrupt narcotics cop, under investigation by Internals Affairs detective Jim McCord, with help from LaGuerta and the main antagonist of Season 5 along with Jordan Chase.Quinn hires Liddy to look into Dexter's past.Liddy discovers Lumen and takes pictures of Dexter and Lumen disposing of Cole Harmon's body, though he is not sure what was in the bags.