WAUKESHA, WI – Friends and family of Tatiana Casap are seeking closure nearly a year after her tragic death, as her son prepares to plead guilty to her murder and the murder of her husband. The community, still reeling from the shock, remembers Tatiana as a devoted mother whose life was abruptly cut short under harrowing circumstances.
Authorities say Tatiana Casap, 35, was killed inside her Waukesha home in mid-February 2025, alongside her husband, Donald Mayer, 51. The crime surfaced when police performed a welfare check after her son, Nikita Casap, failed to attend school for two weeks. Officers discovered the couple’s bodies, concealed by blankets, in a scene investigators described as deeply disturbing.
Tatiana was reportedly still wearing her winter coat when she was found, a detail that underscored the suddenness of the attack. For several days, her body remained in the home, during which time her son allegedly lit candles near the remains. Surveillance audio from the home captured the suspect’s chilling reactions to the aftermath.
Family members and friends of Tatiana have expressed disbelief and grief, describing her as a caring parent striving to build a better life after moving to Wisconsin. Her untimely death sent ripples through the Russian-speaking community that embraced her and her young son after they immigrated to the United States.
Investigators say Nikita Casap, then 18, fled the state in the family vehicle after the murders, making his way to Kansas. Along the way, he allegedly attempted to cover his tracks by impersonating his stepfather through text messages. Observers close to the family grew suspicious due to the out-of-character tone of those messages—suspicions which contributed to the eventual police welfare check.
Court documents reveal that while seeking to conceal evidence, Nikita Casap also took photos of the victims and communicated with individuals overseas about radical political plans. Among these was a manifesto outlining extremist intentions, which law enforcement later described as an apparent motive for the crime.
Detectives suspect that Tatiana’s son acted with the intention of financing a plot he had described in his writings, which involved violent and radical actions against government targets. The extent of her son’s preparations and communications with people abroad underscored the complexity of the case.
Tatiana’s loved ones continue to remember her kind spirit and perseverance in the face of adversity. A candlelight vigil held days after the crime drew dozens who shared memories and mourned the loss of a woman some called “the heart of our neighborhood.”
Nikita Casap faces two counts of intentional homicide and is expected to formally enter guilty pleas during a scheduled court hearing. Prosecutors have agreed to dismiss remaining charges, including theft and hiding a corpse, if the plea is accepted. He could be sentenced to life in prison if convicted.
As her family seeks to heal, Tatiana Casap’s memory remains anchored in the community she helped build, while the legal process now turns toward a resolution in a case that has stunned Waukesha.