State v. Exon: Third-Party Medical Negligence Is Irrelevant Absent a Superseding, Sole Cause; Oral Pronouncement Controls Sentencing

1. Introduction

In State v. Exon (Kan. Apr. 17, 2026), the Kansas Supreme Court addressed two recurring criminal-procedure problems: (1) when a defendant may present expert testimony blaming third parties (here, medical providers) for a victim’s death, and (2) how to remedy a mismatch between a judge’s oral sentence and the written journal entry.

The defendant, Jeffrey James Exon, was convicted of first-degree felony murder (with aggravated endangering a child as the underlying felony), failure to report the death of a child, and aggravated endangering a child, arising from the death of his two-year-old daughter, A.E. The State’s theory centered on prolonged malnutrition and dehydration culminating in A.E.’s death, which the pathologist classified as homicide caused by marasmus (starvation/deprivation of nutrition and hydration).

On appeal, Exon primarily argued that excluding parts of his expert’s opinions prevented him from presenting a complete defense—specifically, an expert critique that A.E.’s medical providers committed “medically negligent” care by not intervening more aggressively or involving child protective services earlier. He also challenged a sentencing journal entry that did not match the sentence orally pronounced from the bench.

2. Summary of the Opinion

  • Convictions affirmed. The court held the trial judge did not abuse discretion in excluding proffered expert testimony about alleged medical malpractice/DFCF referral failures because it was not relevant to whether Exon’s criminal neglect proximately caused A.E.’s death.
  • Sentence vacated in part and remanded. The court ruled the written journal entry’s “683 months” aggregate figure conflicted with the bench pronouncement (“life without parole for 653 months,” plus consecutive guideline counts). The discrepancy was a clerical error correctable by nunc pro tunc order under K.S.A. 22-3504(b).

3. Analysis

3.1. Precedents Cited

Right to Present a Defense vs. Evidentiary Rules

  • State v. J.L.J., 318 Kan. 720, 737, 547 P.3d 501 (2024): Cited for the baseline principle that defendants have state and federal constitutional rights to present a defense. Exon uses this as the starting point, but emphasizes that the right is not absolute.
  • State v. Evans, 275 Kan. 95, 102, 62 P.3d 220 (2003): Supplies the key limitation: exclusion of evidence “integral” to the defense can violate a fair trial, but the defense right remains “subject to statutory rules and caselaw interpretation” of evidence and procedure. Exon applies Evans to uphold exclusion where the proffer fails ordinary admissibility requirements (here, relevance).

Expert Testimony Gatekeeping (Reliability and Relevance)

  • State v. Aguirre, 313 Kan. 189, 196, 198, 485 P.3d 576 (2021): Provides the modern framework under K.S.A. 60-456(b)—trial courts act as gatekeepers assessing reliability and relevance; appellate review asks whether the correct legal standard was used and then evaluates qualification, relevance, and reliability. Exon treats relevance as a decisive failure independent of broader debates over expert reliability.
  • State v. Lyman, 311 Kan. 1, 22, 455 P.3d 393 (2020), and Mooney v. City of Overland Park, 283 Kan. 617, 619-20, 153 P.3d 1252 (2007): Cited to underscore that relevance is a “key component” of gatekeeping. Exon leverages these citations to justify exclusion even where the expert is qualified and the topic might be medically meaningful: if it does not help decide the legal issues in dispute, it does not come in.
  • Manhattan Ice & Cold Storage, Inc. v. City of Manhattan, 294 Kan. 60, 274 P.3d 609 (2012): Cited in connection with abuse-of-discretion review of evidentiary gatekeeping. Exon situates expert-admissibility decisions within that deferential appellate posture.

Proximate Cause, Superseding Cause, and Third-Party Conduct

  • State v. Wilson, 308 Kan. 516, 526, 421 P.3d 742 (2018): Supplies the controlling causation rule: a defendant remains liable when his conduct and mens rea “set events in motion” leading to death unless an unforeseeable event supersedes the act and becomes the sole cause, breaking proximate causation.
  • State v. Kirby, 272 Kan. 1170, 1183, 39 P.3d 1 (2002): Reinforces the limitation: a victim’s or third party’s act cuts off liability only if it is the sole legal cause of harm. Exon uses Kirby to show that “contributing” negligence by others is not a defense to homicide or child-endangerment causation.

Sentencing: Oral Pronouncement vs. Journal Entry

  • State v. Johnson, 320 Kan. 246, 248, 564 P.3d 782 (2025): Reaffirms that sentences are effective when pronounced from the bench and provides the remedy direction (including the syllabus) for correcting mismatched entries.
  • State v. Edwards, 309 Kan. 830, 835-36, 440 P.3d 557 (2019): Establishes that when oral and written sentences conflict, the journal entry contains a clerical error that can be corrected “at any time.”

3.2. Legal Reasoning

(A) Why the expert malpractice opinions were excluded (relevance, not “fairness”)

The court acknowledged the constitutional framing—Exon wanted to show that medical providers should have investigated weight loss more aggressively and involved protective services, which might have prevented death. But the court narrowed the dispositive question to whether Exon’s own conduct constituted criminal neglect that proximately caused A.E.’s death.

The court’s core move was relevance: even if medical providers were negligent (and even if earlier intervention “probably” would have saved A.E.), that would not negate Exon’s criminal liability unless the third-party conduct was an unforeseeable superseding cause and the sole legal cause of death. Under State v. Wilson and State v. Kirby, mere “contributing factors by other parties” do not diminish culpability.

Critically, the court observed that the proffered expert opinions did not “challenge” the State’s causation theory; they largely supported it. The expert report attributed “some culpability” to Exon, particularly in the last three days when the child became increasingly lethargic, emphasized that a two-year-old is not developmentally independent to feed herself, and referenced evidence that the child was dead for a prolonged period before authorities were called. Given that alignment with the State’s theory, the “malpractice” label and the DCF assessment commentary did not supply a legally recognized defense and risked distracting the jury into a comparative-fault narrative foreign to criminal proximate-cause doctrine.

(B) Gatekeeping and standard of review (abuse of discretion)

Applying K.S.A. 60-456(b) and the framework described in State v. Aguirre, the court evaluated whether the district court correctly applied the legal standard and then whether the testimony was sufficiently relevant. It held the court properly performed its gatekeeping role and did not abuse discretion. Importantly, the Supreme Court did not need to endorse or reject the substance of the malpractice opinions; it affirmed exclusion because those opinions did not assist the jury on the controlling legal questions.

(C) Sentencing journal entry mismatch: oral controls

The district court pronounced a life sentence with parole ineligibility tied to “653 months,” plus consecutive terms on the remaining counts. The journal entry instead reflected “life without the possibility of parole until 683 months are served,” apparently aggregating guideline months into the indeterminate life sentence.

Under State v. Johnson and State v. Edwards, the oral pronouncement controls, and the inconsistent journal entry is a clerical error. The remedy is a nunc pro tunc correction under K.S.A. 22-3504(b), so the case was remanded for a corrected sentencing journal entry.

3.3. Impact

Expert “third-party blame” in child-death prosecutions

State v. Exon strengthens a practical evidentiary rule in Kansas criminal cases: expert testimony criticizing third-party medical decision-making is inadmissible when offered merely to show someone else could have prevented the death, unless it tends to prove a legally operative break in proximate causation (i.e., an unforeseeable superseding cause that becomes the sole legal cause). This will matter in prosecutions involving malnutrition, dehydration, delayed medical care, and similar neglect-based homicides where defendants often seek to reframe the case as institutional failure rather than caretaker conduct.

Sharper focus on “relevance” within K.S.A. 60-456(b) gatekeeping

The decision signals that Kansas courts may resolve many expert-admissibility disputes on relevance alone, without extended hearings on whether the opinion is “right,” “accepted,” or methodologically perfect—particularly when the opinion does not map onto an element, defense, or recognized legal doctrine.

Sentencing administration and appellate cleanup

On sentencing, Exon reinforces a clear operational directive: when oral and written sentences conflict, the written document must be conformed to the oral pronouncement via nunc pro tunc correction. The case thus contributes to uniformity and reduces the risk that clerical aggregation errors alter parole ineligibility calculations.

4. Complex Concepts Simplified

  • Gatekeeping (K.S.A. 60-456(b)): The judge screens expert testimony before the jury hears it, ensuring it is both (a) dependable enough and (b) actually helpful to deciding the issues in the case.
  • Relevance: Evidence is relevant only if it makes a legally important fact more or less likely. Even “true” information can be excluded if it does not help answer the legal questions the jury must decide.
  • Proximate cause: A legal link between conduct and result. In homicide/neglect cases, the question is whether the defendant’s conduct is a legal cause of death.
  • Superseding cause: A new, unforeseeable event that breaks the causal chain so the defendant’s conduct is no longer a legal cause. Kansas law (as applied here) requires it to be the sole legal cause to cut off criminal liability.
  • Nunc pro tunc: A court order correcting the record to reflect what the court actually decided earlier (commonly used for clerical sentencing mistakes).

5. Conclusion

State v. Exon clarifies that a defendant cannot convert a neglect-based homicide case into a comparative inquiry about whether doctors “should have done more,” unless the evidence supports a true superseding-cause theory that would sever proximate causation. The opinion also reinforces the sentencing doctrine that the oral pronouncement controls and that conflicting journal entries are clerical errors correctable by nunc pro tunc order. Together, these holdings tighten trial focus on legally material disputes—causation and culpable neglect—while promoting accuracy and uniformity in sentencing records.