Nikita Casap faces life sentence decision in Waukesha courtroom for 2025 double homicide case

Sentencing set after guilty pleas

A Waukesha County judge is scheduled to sentence Nikita Casap on Thursday, March 5, for the 2025 killings of his mother, Tatiana Casap, and stepfather, Donald Mayer, at their home in the Village of Waukesha. Casap, now 18, has pleaded guilty to two counts of first-degree intentional homicide in Waukesha County Circuit Court.

In Wisconsin, first-degree intentional homicide carries a mandatory life sentence. The central sentencing question is whether the court will set parole eligibility after a specified minimum period or deny parole eligibility entirely, resulting in life imprisonment without the possibility of parole.

What prosecutors and defense have placed before the court

The guilty pleas were entered under an agreement in which prosecutors dismissed seven additional charges while retaining the ability to argue sentencing based on the broader case record. The dismissed counts included allegations such as hiding a corpse and theft-related offenses. The court may consider underlying conduct referenced in filings and arguments when determining the structure of the life sentences.

Materials submitted ahead of sentencing include victim impact statements from family members describing the lasting effects of the deaths, alongside an evaluation prepared for the defense that addresses Casap’s background, social adjustment, and online activity over time. The defense submission describes a trajectory of increasing isolation and exposure to extremist content, as well as claims of influence by another individual, and presents these points in support of a sentencing outcome that preserves a later opportunity for release review.

• Two life sentences are required by statute for the homicide convictions.
• The judge will decide whether Casap is eligible for parole after a minimum period, or ineligible for parole.
• Dismissed charges remain part of the case context the court can weigh at sentencing.

Investigation timeline and case background

Law enforcement responses began with a welfare-check request at the family residence in late February 2025. Authorities later identified the two deceased individuals as Donald Mayer, 51, and Tatiana Casap, 35. Court filings and investigative summaries describe allegations that the victims were shot earlier in February 2025 inside the home, and that Casap later left Wisconsin and was arrested following a traffic stop in Kansas on Feb. 28, 2025.

“Accountability matters.”

How the sentence will be framed

At sentencing, the court is expected to address punishment, community protection, and the scope of any parole-eligibility timeline. The hearing will also provide a formal opportunity for victim impact statements and for the defense to argue mitigating factors, before the judge sets the final judgment on the two life terms.