What Is First-Degree or Second-Degree Homicide in Wisconsin?

 Posted on July 22, 2026 in Criminal Defense

First-degree intentional homicide in Wisconsin means causing someone's death on purpose. Second-degree intentional homicide involves an intentional killing too. But it happens under circumstances the law treats as less blameworthy.

Facing a homicide charge is one of the most serious situations a person can go through. You need to know exactly what you're charged with – and why – so you can fight it. If you’re facing charges in 2026, contact Bucher Law Group, LLC. Our Dodge County criminal defense lawyer can help you understand the charge against you. Together, we can begin building your defense right away.

How Does Wisconsin Law Define First-Degree Intentional Homicide?

Wisconsin defines first-degree intentional homicide under Wisconsin Statute Section 940.01. This law makes it a crime to cause the death of another human being with the intent to kill that person or another person.

This is the most severe homicide charge in Wisconsin. It carries a mandatory sentence of life imprisonment. However, a judge does have some discretion regarding eligibility for extended supervision in certain cases.

Intent is such a central element of this charge. Because of this, much of a defense often focuses on whether the state can actually prove the killing was intentional.

How Does Second-Degree Intentional Homicide Differ From First-Degree?

Wisconsin Statute Section 940.05 defines second-degree intentional homicide. It applies when a person intentionally causes another person's death but does so under certain mitigating circumstances recognized by law. These circumstances include adequate provocation. This means the person was provoked to the point that a reasonable person would have lost self-control.

They also include an unnecessary defensive force situation. This is when the person actually believed they needed to use force to defend themselves or another person, but that belief was unreasonable given the circumstances.

Second-degree intentional homicide is different from first-degree homicide in one key way. It does not carry a mandatory life sentence. This reflects the law's view that these situations are less morally blameworthy than a cold, calculated killing.

What Is "Adequate Provocation" Under Wisconsin Law?

"Adequate provocation" is an important legal concept in homicide cases because it can reduce a charge from first-degree to second-degree. It generally requires two things. First, the defendant must have been provoked by conduct serious enough to cause a reasonable person to lose self-control completely.

Second, the killing must have happened in the heat of that provocation, without time to cool off. This isn't the same as simply being angry or upset. Wisconsin courts look closely at the specific facts of each case. This includes how much time passed between the provocation and the killing. A longer gap can undermine an argument that the person acted in the heat of the moment.

What Does "Unnecessary Defensive Force" Mean in a Homicide Case?

The concept of "unnecessary defensive force" means that someone genuinely, but unreasonably, believed they needed to use deadly force to protect themselves or someone else. The key difference here is between a reasonable and unreasonable belief.

Say a person's belief that force was necessary was reasonable given the circumstances. This could support a full self-defense claim instead. That could lead to an acquittal rather than a reduced charge.

Say the belief was genuine but unreasonable instead. This means a reasonable person in the same situation wouldn't have seen the same level of threat. In that case, the charge may be reduced to second-degree intentional homicide rather than staying at the first-degree level.

Schedule a Free Consultation With Our Ozaukee County, WI Homicide Defense Attorney

Facing a homicide charge means facing the most severe consequences the legal system can impose. You need an attorney who genuinely understands how these cases are built and prosecuted.

With two decades on the other side of the courtroom as Waukesha County's District Attorney, Attorney Paul E. Bucher understands exactly how prosecutors build these cases from the ground up. His peers elected him twice to lead the State Wide District Attorneys Association, and he served on numerous statewide task forces focused on violent crime. Over the course of his career, he's directed or personally tried dozens of homicide cases, along with hundreds of drunk driving matters and thousands of serious drug prosecutions, including some of the most complex and closely watched cases in the state. That background gives every client he represents a rare, insider's perspective on how these cases unfold.

Contact Bucher Law Group, LLC at 262-446-9222 to talk to our Dodge County criminal defense lawyer today.