Brutal Brides is the nineteenth episode of Season 7. It aired on November 22, 2013.
In 1899 California, Katie Cook's husband, Tom, is a shameless womanizer with a taste for teenage girls, which reflects poorly on Katie's virtue. When Tom begins an affair with a servant girl, Katie has had enough and shoots Tom in the head while he sleeps. She is acquitted of the murder because of Tom's reputation, but questions about her motives still persist. When Pauline Rogers' husband, Luther, falls mysteriously ill in 1982, she plays the role of the devoted wife, but Luther learns that Pauline has poisoned his favorite strawberry ice cream with pesticide containing arsenic. Luther survives, but police discover that Pauline also used arsenic to murder her previous husband, and she receives two 20-year sentences. In 1930s Philadelphia, saleswoman Rose Carina earns her nickname of "Kiss of Death": she and partner Paul Petrillo supply women with a special "potion" - arsenic - to rid themselves of unwanted relatives, and Rose herself uses the "potion" to kill three husbands. Paul is sentenced to death and almost 30 other women stand trial for murder, but Rose is unbelievably acquitted.