Date: Apr 8, 2026

Second-Degree Murder and U.S.S.G. § 5K2.6: Weapon-Use Departures Require Atypical, Heartland-Exceeding Findings; Erroneous Departures May Taint a Variance

I. Introduction

In United States v. Tillman (10th Cir. Apr. 7, 2026) (Order and Judgment), the Tenth Circuit vacated and remanded a 360-month sentence imposed after a guilty plea to second degree murder under 18 U.S.C. §§ 1111 and 1153. The district court had started from an unobjected-to advisory Guidelines range of 168–210 months (offense level 35, CHC I), then increased the range dramatically by applying upward departures under U.S.S.G. §§ 5K2.6 (two levels) and 5K2.0 (three levels), yielding 292–365 months, and then imposed 360 months (described as both departure-driven and as a variance under 18 U.S.C. § 3553(a)).

The core legal issues on appeal were (1) whether § 5K2.6 (Weapons and Dangerous Instrumentalities) can apply to a second-degree murder sentence given that murder typically “subsumes” dangerous-instrumentality use, and (2) whether any error was harmless in light of the district court’s invocation of § 3553(a). Although the defendant also criticized the district court’s explanation of the overall magnitude of the five-level departure, the panel resolved the case on the categorical/misapplication point and harmlessness.

II. Summary of the Opinion

The Tenth Circuit held that the district court erred by departing upward under U.S.S.G. § 5K2.6 because, under circuit law, weapon use is generally within the heartland of second-degree murder and the district court did not make findings showing that Tillman’s firearm use was extraordinary or atypical relative to typical second-degree murder cases. The court further held the error was not harmless because the government did not prove, by a preponderance, that the improper § 5K2.6 departure did not affect the ultimate 360-month sentence, particularly given the magnitude of the deviation from the original advisory range and the overlap between the departure rationales and the variance rationale. The panel therefore vacated and remanded for resentencing.

III. Analysis

A. Precedents Cited

United States v. Kelly, 1 F.3d 1137 (10th Cir. 1993)

Kelly is the controlling anchor for the panel’s § 5K2.6 analysis. There, the Tenth Circuit reasoned that “murder must subsume the use of a dangerous instrumentality,” so a weapon-use departure under § 5K2.6 is ordinarily improper for second-degree murder because the Sentencing Commission, in setting the base offense level for murder, necessarily contemplated that death is inflicted by a dangerous mechanism.

In Tillman, the panel treated Kelly not as an absolute bar, but as establishing a strong presumption: § 5K2.6 is unavailable unless the defendant’s weapon use is outside the heartland of second-degree murder cases. The error occurred because the district court did not supply findings that crossed that threshold.
United States v. Barber, 119 F.3d 276 (4th Cir. 1997) (en banc)

The panel cited Barber to reinforce the “heartland” framing: weapon use is generally within the heartland of second-degree murder, and a sentencing court must identify what makes the particular weapon use atypical before departing. Barber thus functions as persuasive inter-circuit support for the proposition that murder guidelines already account for typical firearm use.
United States v. Lee, 71 F.4th 1217 (10th Cir. 2023)

Lee supplied (1) the standard of review for legal validity of a departure (de novo in this context) and (2) the remedial principle that when an appellate court cannot know whether the district court would have imposed the same sentence absent a Guidelines error, it must vacate and remand. Tillman uses Lee as a practical template for resentencing when uncertainty remains.
United States v. Lente, 647 F.3d 1021 (10th Cir. 2011) and United States v. Kaufman, 546 F.3d 1242 (10th Cir. 2008)

These cases supplied the Tenth Circuit’s harmless-error framework at sentencing: the government, as beneficiary of the error, bears the burden to prove harmlessness by a preponderance, and an error is harmless only if it did not affect the district court’s selection of the sentence imposed. Tillman applies these standards strictly, emphasizing that where the record suggests the departure analysis may have fed into the variance analysis, harmlessness cannot be assumed.
United States v. Barnes, 141 F.4th 1156 (10th Cir. 2025)

The government relied on Barnes-type reasoning: even if the departure was wrong, the variance could sustain the same sentence. The panel distinguished that approach on the facts: here, the record gave “no convincing reassurance” that the departure error did not influence the variance, particularly given the district court’s explicit reference to firearm “utilization” when discussing § 3553(a) and the similarity between the departure and variance rationales.
United States v. Harrison, 743 F.3d 760 (10th Cir. 2014)

Harrison underscores that harmlessness fails where affirmance would require appellate speculation about whether the district court would have reached the same sentencing outcome absent the error. Tillman treats speculation as impermissible given the record’s ambiguity.
United States v. Williams, 48 F.4th 1125 (10th Cir. 2022) and United States v. Roberts, 14 F.3d 502 (10th Cir. 1993)

These cases supported the panel’s refusal to “backfill” missing sentencing findings. The government attempted to recharacterize the § 5K2.6 departure as actually based on endangerment or trauma to the child witness. The panel responded: the district court did not make those express findings under § 5K2.6, and the appellate court will not speculate or engage in initial factfinding to uphold the sentence.
Collins v. Yellen, 594 U.S. 220 (2021)

The panel cited Collins for an interpretive canon: when a legal text includes a concept in one place but omits it in another, the omission is presumed intentional. The court used this to explain why psychological trauma is not naturally “read into” § 5K2.6 (which addresses weapon dangerousness/manner/endangerment), especially given other guideline provisions that more directly address psychological harm.

B. Legal Reasoning

1. The § 5K2.6 Departure: “Murder Subsumes Weapon Use,” Unless the Case Is Atypical

Section 5K2.6 allows an upward departure when “a weapon or dangerous instrumentality was used or possessed,” with the extent depending on “dangerousness,” “manner” of use, and “the extent to which its use endangered others,” noting that discharge of a firearm “might warrant a substantial sentence increase.”

But the panel held that in second-degree murder cases, § 5K2.6 cannot be applied as a routine “firearm used” add-on, because the base offense level for murder already assumes a deadly and dangerous means. Under United States v. Kelly, a § 5K2.6 departure is therefore valid only in the “rare circumstance” where the weapon use is outside the “heartland” of the murder guideline (U.S.S.G. § 2A1.2).

The district court’s stated reasons did not satisfy that standard. In particular:

The district court emphasized firearm use “without justification.” The panel held this adds nothing because second-degree murder requires “malice aforethought,” which itself implies unjustified lethal force; thus, “without justification” is typical, not atypical.
The government argued endangerment of the child witness (e.g., potential line-of-fire risk, car-crash scenario), but the district court did not make express findings that (a) such endangerment occurred and (b) the endangerment was so unusual in degree or manner as to be outside the heartland.
The government also suggested psychological trauma, but the district court did not identify trauma as the § 5K2.6 basis, and the panel cautioned that § 5K2.6 does not mention psychological injury and other provisions more directly address it.

Result: without findings tethered to an “atypical heartland” theory, the § 5K2.6 departure was legal error.

2. Harmless Error: A Large Variance Does Not Automatically Cure a Guidelines Departure Error

The government’s central harmlessness argument was that the district court also imposed (and adequately justified) the same sentence as a variance under § 3553(a), and the defendant did not challenge the variance itself on appeal.

The panel rejected harmlessness because the government failed to carry its burden under United States v. Lente: it did not prove the § 5K2.6 error “did not affect” the sentence selection. Several record features drove that conclusion:

Magnitude of the deviation: The sentence effectively moved from a 168–210 month range to a 360-month outcome—an increase on the order of 10–13 years. That scale heightens concern that the Guidelines error materially shaped the sentencing anchor.
Intertwined rationales: The district court referenced firearm “utilization” during the § 3553(a) discussion, implying reliance on the same considerations that animated the erroneous § 5K2.6 departure. The panel also noted the similarity between the court’s explanations under § 5K2.0 and § 5K2.6.
No appellate speculation: Under United States v. Harrison, if affirmance requires guessing whether the district court would have imposed the same sentence absent the erroneous departure, the error is not harmless.

Consequently, the sentence was vacated and remanded for resentencing.

3. The 2025 Guidelines Amendment Did Not Make Remand “Futile”

The opinion briefly addressed the government’s contention that remand was pointless because Guidelines departures were removed effective November 1, 2025. The panel’s response was practical rather than academic: because the government did not establish that the same 360-month sentence would necessarily be imposed purely as a variance absent the § 5K2.6 departure, resentencing remained necessary.

C. Impact

Sharper limits on weapon-use departures in murder cases: In the Tenth Circuit, sentencing courts may not invoke § 5K2.6 in second-degree murder based merely on the fact that a firearm was used or discharged; they must articulate what makes the use atypical of the murder guideline’s heartland.
Record-building requirement: If the theory is endangerment of others (especially bystanders), the court must make specific findings and also explain why the endangerment is unusually severe or unusual relative to typical second-degree murder fact patterns.
Harmlessness is demanding where the variance is large and reasoning overlaps: A district court’s simultaneous reference to departures and § 3553(a) does not automatically insulate a sentence; when rationales are intertwined, the government must affirmatively show the Guidelines error did not influence the variance outcome.
Post-departure era significance: Even with departure provisions removed in the 2025 Guidelines amendments, Tillman remains instructive on (a) not double-counting conduct already baked into the base guideline and (b) the continuing need for explicit findings and transparent reasoning when increasing sentences substantially via § 3553(a).

IV. Complex Concepts Simplified

Departure vs. Variance: A departure is an adjustment contemplated by the Guidelines framework (here, former Chapter 5K policy statements). A variance is a sentence outside the advisory Guidelines range based on the statutory factors in 18 U.S.C. § 3553(a). A court may do either or both, but it must explain the reasons clearly enough to permit appellate review.
“Heartland”: The “heartland” is the set of typical cases the guideline was designed to cover. A departure is generally reserved for facts that make the case meaningfully different from the typical case.
Why “weapon used” is usually not a basis for an upward departure in murder: Because murder (by definition) involves lethal force, the Guidelines for murder already presume a dangerous instrumentality. Adding extra punishment for weapon use risks double counting unless the weapon use is extraordinary in kind, degree, or consequences.
Harmless error at sentencing: Even if a court makes a mistake, the sentence can be affirmed only if the government shows the mistake did not matter to the final sentence. If the record suggests the mistake may have influenced the sentence—especially a large increase—the appellate court typically remands.

V. Conclusion

United States v. Tillman reinforces a key constraint on sentencing escalation in second-degree murder cases: U.S.S.G. § 5K2.6 cannot be used merely because a firearm was used or discharged; the sentencing court must identify atypical, heartland-exceeding weapon-related facts and make express findings supporting that conclusion. The decision also underscores that an erroneous departure can taint a variance, and the government bears a meaningful burden to prove harmlessness—particularly where the sentence dramatically exceeds the unchallenged advisory range and the district court’s reasoning overlaps across departure and variance discussions.