The Steven Pladl case involves a disturbing series of events centered around Steven Pladl, his biological daughter Katie Pladl, and his ex-wife Alyssa. In 2017, Steven and Katie, who had been separated for most of her life and reconnected as adults, began a romantic and sexual relationship. This relationship, which was both incestuous and illegal, came to light when Steven's ex-wife, Alyssa, discovered what was happening.