Utah Court of Appeals
What constitutes criminal negligence in Utah negligent homicide cases? State v. Boss Explained
Summary
Defendant was convicted of negligent homicide after attempting to pass two or more cars on a two-lane highway at 70 mph in the face of oncoming traffic, then making sharp steering corrections that caused her vehicle to lose control and strike an oncoming car, killing a four-year-old passenger. The Court of Appeals affirmed, finding sufficient evidence of both criminal negligence and causation.
Analysis
In State v. Boss, the Utah Court of Appeals clarified the boundaries between ordinary negligence and criminal negligence in the context of vehicular negligent homicide prosecutions.
Background and Facts
Defendant Dorothy Boss was driving westbound on Highway 73 when she attempted to pass two or more cars by entering the eastbound lane despite oncoming traffic. Traveling at 70 mph in a 65 mph zone, Boss made aggressive steering maneuvers to return to the westbound lane, causing her vehicle to lose control and slide sideways into the eastbound lane. Her car struck an oncoming vehicle, killing four-year-old Jaycee Hathaway. Expert testimony indicated Boss’s vehicle likely hit a driveway that acted as a ramp, causing the car to lift and roll onto its side.
Key Legal Issues
Boss challenged her negligent homicide conviction on two grounds: (1) her conduct did not rise to the level of criminal negligence, and (2) her actions were not the proximate cause of the collision. Under Utah Code section 76-5-206(1), negligent homicide requires that the actor, acting with criminal negligence, causes another’s death.
Court’s Analysis and Holding
The court distinguished this case from State v. Larsen, where a defendant’s simple failure to see an oncoming car during a left turn was deemed insufficient for criminal negligence. Here, Boss’s conduct involved multiple deviations from the standard of care: excessive speed, improper passing maneuvers in the face of oncoming traffic, and aggressive steering corrections. The court found this combination created a “substantial and unjustifiable risk of death” and constituted a “gross deviation from the standard of care that an ordinary person would exercise.”
Regarding causation, the court applied the principle from State v. Hallett that when a party’s wrongful conduct creates a condition of peril, it can be the proximate cause of resulting injury even when other factors contribute to the harm.
Practice Implications
This decision reinforces that criminal negligence requires more than ordinary carelessness—it demands conduct that grossly deviates from reasonable care standards. For practitioners, the case illustrates how multiple traffic violations combined with excessive speed can elevate conduct from civil negligence to criminal culpability. The court’s emphasis on “repeated deviations” suggests that isolated acts of poor judgment may not suffice, but a pattern of dangerous driving behaviors can support criminal negligence charges.
Case Details
Case Name
State v. Boss
Citation
2005 UT App 520
Court
Utah Court of Appeals
Case Number
No. 20040714-CA
Date Decided
December 8, 2005
Outcome
Affirmed
Holding
Attempting to pass multiple vehicles on a two-lane highway at excessive speed in the face of oncoming traffic, followed by aggressive steering that causes loss of vehicle control, constitutes criminal negligence sufficient to support a negligent homicide conviction.
Standard of Review
Sufficiency of evidence claims: evidence is sufficient unless sufficiently inconclusive or inherently improbable that reasonable minds must have entertained a reasonable doubt, examining evidence in light most favorable to the verdict
Practice Tip
When challenging sufficiency of evidence in criminal cases, focus on whether the evidence shows conduct that constitutes a gross deviation from ordinary care standards, not merely negligent behavior.
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