When Can a Fatal Crash Lead to Criminal Negligence Charges in Wisconsin?

 Posted on March 05, 2026 in Criminal Defense

Not every fatal car accident leads to criminal traffic violation charges. However, some do, and the threshold can be lower than most people expect. In a case cited under Wis. Stat. § 940.10, a driver was convicted of homicide by negligent operation of a vehicle for running a red light at 50 mph, even though the posted speed limit on that road was 55 mph.

Under Wisconsin law, it is not the speed itself that matters. It is whether the conduct created a serious and unreasonable risk of death. If you are facing charges after a fatal crash in 2026, our Dodge County, WI traffic violations defense lawyer can help you understand what you're up against and what options are available.

What Is Criminal Negligence in Wisconsin?

Under Wis. Stat. § 939.25, criminal negligence means ordinary negligence to a high degree. It is conduct that the person should realize creates a substantial and unreasonable risk of death or great bodily harm to another person.

This is different from a simple mistake or a momentary lapse in attention. Criminal negligence requires a level of carelessness that goes well beyond what any reasonable person would consider acceptable. The driver doesn't have to have meant to hurt anyone, but they have to have acted in a way that a reasonable person would have recognized as dangerous.

What Is Homicide by Negligent Operation of a Vehicle in Wisconsin?

Under Wis. Stat. § 940.10, a person who causes the death of another by the negligent operation or handling of a vehicle is guilty of a Class G felony. This charge does not require any intent to harm. What it requires is that the driver's conduct met the definition of criminal negligence and that the negligent driving caused the death.

What Is Homicide by Intoxicated Use of a Vehicle in Wisconsin?

Wis. Stat. § 940.09 applies when a driver causes a death while operating a vehicle under the influence of alcohol or drugs. Wisconsin courts have recognized that driving while intoxicated is inherently dangerous. However, the state must still show that the intoxicated driving caused the death.

How Is Reckless Homicide Different in Wisconsin?

These charges are related but carry different legal standards. Reckless homicide requires proof of criminal recklessness, which is a higher standard than criminal negligence. Recklessness means the driver was aware of the risk they were creating and consciously disregarded it. Criminal negligence, by contrast, only requires that the driver should have been aware of the risk, even if they were not actually thinking about it in the moment.

That distinction matters in how prosecutors approach a case and in how a defense attorney can respond. A charge built on negligence may be more defensible than one built on recklessness, depending on the facts.

What Defenses Are Available After a Fatal Crash in Wisconsin?

Being charged is not the same as being convicted. Several defenses may apply depending on the circumstances:

• Challenging causation: The state must prove that your driving actually caused the death. If another driver, hazardous road conditions, or a mechanical failure played a role, that can be challenged.
• Challenging criminal negligence: Not every bad driving decision rises to the level of criminal negligence. If the evidence shows an ordinary mistake rather than a serious departure from safe driving, that matters.
• Challenging the evidence: Accident reconstruction reports, witness statements, and toxicology results can all contain errors. Examining and challenging that evidence is a key part of the defense.
• Constitutional violations: If police gathered evidence improperly, that evidence may be suppressed.

Schedule a Free Consultation With Our Walworth County, WI Criminal Defense Attorney

Attorney Bucher spent 20 years as the Waukesha County District Attorney, was twice elected President of the Statewide District Attorneys Association, and served on dozens of statewide task forces on violent crimes. He has litigated the most high-profile and complicated cases in the State of Wisconsin, personally handling dozens of homicides, hundreds of drunk driving offenses, and thousands of serious cases across his career. That depth of experience is now on your side. Call Bucher Law Group, LLC at 262-446-9222 to schedule a consultation with our Dodge County, WI traffic violations defense lawyer today.