Bitch In Sheeps Clothing / Cold Case

• The killer in "Gleen". Being a retired firefighter and caring father makes for fine sheep's clothing. But underneath, he's a controlling, overbearing monster who scared off his first and third wives and killed his second wife, the victim and mother of their child, with a bomb he plants.
• In episode 9 of season 1, we have Sherry Fox. Outside: A beautiful, caring young woman who loves her boyfriend. Inside: Con artist, gold digger, murderer.
• In "Justice", we have the victim Mike Delaney: a handsome college student who was considered a 'Casanova' and had good grades, was a varsity athlete, a charitable member of the Meals on Wheels program, and made valedictorian at graduation. But all that goes out the window once you learn he was a serial rapist in life.
• Almost literally with the killer in "Churchgoing People". All flashbacks of her show her as a prim, modestly dressed and coifed woman. Until her son finally confesses that she was actually a violent and abusive drunk who regularly beat his father and finally killed him in a rage upon learning of his infidelity.
• "Slipping" gives us the victim's husband, her own killer. He throws off the audience by claiming he wrote his poem as a dedication to his wife. But once you learn he actually stole that poem from her before killing her, it becomes clear he only married her to be close to the competition.
• The professor in "Hubris". When we meet him, he's a broken man whose marriage and career were ruined by the murder suspicions and the fact that not only had he had an affair with the victim, she wasn't his first dalliance. Despite his cheating, it's easy to have a little sympathy for him given that he regrets his behavior and just wants to clear his name and get his life back. Until the end of the episode where we learn that he IS the killer, every single thing that happened to him is fully deserved, and he's actually an arrogant bastard who isn't the least bit sorry for what he did. Indeed, he felt completely entitled to seduce his female students and to kill the one girl who dared break up with him rather than him be the one to dump her, to the point where he outright states, "It's her fault. She made me fall in love with her."
• In "Who's Your Daddy", Brad Atwater is this to an extent. Although the foreman is earlier described as an unfair boss to his employees, he's initially introduced as a friendly sort who has a family of four, and an ailing wife he cares about. But later, it's revealed that not only is he unfaithful to said-wife, he makes the wives of his Asian employees service him sexually by licking his boots. And later, when the wife offers some evidence, Atwater denounces her as crazy and even claims her illness is probably 'made up'.
• Harold from "Discretion" was the partner of the victim Greg Viscaino. Greg is posthumously implicated in a financial which was committed by Harold. Confronted with this fact, Harold berates Greg's by saying that he liked his boys young and cheap.
• Iris from "WASP" is a war hero and a pioneer for women's rights in the military. She also killed Vivian to protect the WASP program from being shut down. When confronted with this charge, Iris acts all high and mighty, as if women in the workplace like Lilly owe her for their positions.
• Sean Murphy from "Glued" seems at first to be a kindly, if racist, shopkeeper. He talks a big game about attacking the drug addicted black delinquents in the neighborhood, but when they force little Tim Barnes to shoplift a stick of glue, Tim doesn't attack them but goes after Tim and accidentally kills him. On his first appearance, Sean low-key brags about killing Tim.
• Chandra from "Soul" seems at first to be a kind, mild-mannered church lady until she is revealed to be the murderer who is still intensely possessive of Billy and hateful of Beatrice.

---