Tatiana Casap, 35, was found dead inside her family home on Cider Hills Drive in the Village of Waukesha on February 28, 2025, though investigators later concluded she had been killed on February 11. Court records described an apparent gunshot exit wound near her right shoulder; decomposition and blankets covering her body indicated she had been dead for a considerable period. Her husband, Donald Mayer, was also found dead inside the house with an apparent gunshot wound to the back of his head; a Smith & Wesson .357 Magnum that Mayer had purchased was missing from the residence.

Investigators say evidence focused on Tatiana’s 17-year-old son, Nikita Casap. A classmate reportedly told detectives Casap had talked about killing his parents in the weeks before the homicides.

Casap was charged in Waukesha County with two counts of first-degree intentional homicide and multiple related felonies. Prosecutors later said his devices contained extremist material and alleged plans involving explosives and an assassination plot that helped explain motive. He pleaded guilty to both homicides in January 2026 and was sentenced to life without parole on March 5, 2026. Does anyone have information about the family or the home on Cider Hills Drive that could shed light on the period leading up to February 11, 2025?