Watch "Nancy Grace Mysteries: Kissel Brothers," Friday night at 8 p.m. ET on HLN.
Robert and Nancy Kissel, along with their three children, seemed like the picture perfect family. Robert was a prominent banker and Nancy Kissel his loving wife—at least until she enters into an affair. As Robert becomes suspicious of his wife’s infidelity things appear to go terribly wrong. The esteemed executive is given a strawberry milkshake made by his wife and is found bludgeoned to death inside a rolled-up carpet near the family home. What drove this mom-of-3 to murder?