What Zumwalt established in 1950 and why it still defines the insurer-insured relationship today
Missouri Injury & Insurance Law | missouriinjuryandinsurancelaw.com
Introduction
Missouri has long recognized that the relationship between a liability insurer and its insured is not merely contractual—it is fiduciary in character. When an insurer assumes control of the defense of an action against its insured and retains the exclusive right to settle, it accepts obligations that extend well beyond those of an ordinary contracting party. The foundational Missouri authority on this point, Zumwalt v. Utilities Insurance Co., 228 S.W.2d 750 (Mo. 1950), established principles that continue to govern insurer conduct in Missouri courts more than seven decades later. For practitioners handling personal injury and coverage cases, understanding the scope of this fiduciary obligation is essential to identifying when an insurer has crossed the line from aggressive claims management into actionable bad faith.
The Foundation: Zumwalt and the Fiduciary Relationship
The Missouri Supreme Court’s decision in Zumwalt v. Utilities Insurance Co., 228 S.W.2d 750 (Mo. 1950), remains the seminal statement of the insurer’s fiduciary obligations in Missouri. The court held that when a liability insurer assumes control of the defense and retains the exclusive right to settle, a fiduciary relationship arises and the insurer is obligated to discharge its duties with the utmost good faith. The rationale is straightforward: by assuming control of the litigation, the insurer deprives the insured of the ability to protect his or her own interests. Having extracted that right from the insured through the policy’s terms, the insurer must exercise it responsibly.
“When, by the terms of its policy, a liability insurer presumes to undertake and control the defense of an action against its insured and maintains the exclusive right to settle the claim, a fiduciary relationship arises, and the insurer is obligated to discharge its fiduciary duty to its insured with the utmost good faith.” Zumwalt v. Utils. Ins. Co., 228 S.W.2d 750, 755 (Mo. 1950).
The Eighth Circuit reinforced this principle in W. Cas. & Sur. Co. v. Herman, 405 F.2d 121 (8th Cir. 1968), applying Missouri law and confirming that the fiduciary duty arising from control of the defense is a well-settled rule. Herman is particularly significant because it demonstrates that federal courts sitting in diversity fully accept and apply Missouri’s robust fiduciary standard when evaluating insurer conduct—meaning practitioners should cite both Zumwalt and Herman when arguing fiduciary breach in any Missouri forum.
What the Fiduciary Duty Requires
The practical content of the fiduciary duty is demanding. The insurer is required to protect the interests of its insured, as well as its own. Crucially, where the interests of the insured and the insurer diverge—as they inevitably do when the claim value approaches or exceeds policy limits—the insurer is obligated to pursue the insured’s interests even when doing so is contrary to the insurer’s financial interest. This is the core principle that animates bad faith failure to settle claims: the insurer that gambles with an excess judgment to preserve its bottom line has subordinated the insured’s interests to its own, in direct violation of the fiduciary duty recognized in Zumwalt.
The fiduciary duty requires, at minimum: prompt and thorough investigation of the claim; honest assessment of the claimant’s damages and the likelihood of an excess verdict; genuine consideration of the insured’s exposure when evaluating settlement demands; and transparent communication with the insured about the status of the claim and the risks of litigation. An insurer that conducts a perfunctory investigation, fails to inform the insured of a significant settlement demand, or refuses a reasonable demand without consulting the insured has failed each of these obligations.
The Insured’s Loss of Control as the Source of the Obligation
The Zumwalt court’s reasoning is grounded in a careful analysis of what the insured surrenders by purchasing a liability policy with a defense clause and a settlement control provision. Without insurance, an individual defendant has complete autonomy over his or her defense—the right to choose counsel, decide whether to settle, and determine litigation strategy. The liability policy transfers all of these rights to the insurer. In exchange for this extraordinary grant of authority, the law imposes the fiduciary obligation. The insured’s vulnerability is the measure of the insurer’s obligation.
This analytical framework has important implications for how practitioners should approach bad faith cases. The insured’s loss of control is not merely background context—it is the legal basis for the fiduciary duty. Practitioners should develop testimony from the insured about the practical experience of having no say in the defense of a significant lawsuit: the inability to direct settlement negotiations, the lack of information about reserve amounts, the exclusion from strategic decisions. This human dimension of the insured’s position makes the fiduciary framework compelling to judges and juries alike.
Conflicting Interests and the Insurer’s Obligation to Subordinate Its Own
The most demanding aspect of the Zumwalt fiduciary duty is the requirement that the insurer subordinate its own interests to the insured’s when they conflict. In practice, this means that an insurer with a $100,000 policy facing a claim with a reasonable verdict range of $500,000 to $1,000,000 cannot rationally evaluate a $100,000 settlement demand solely through the lens of its own exposure. The insurer must give equal, and if necessary, superior weight to the insured’s exposure to an excess judgment. An insurer that refuses a within-limits demand because it believes—even correctly—that there is a chance of a defense verdict has placed its own financial interest ahead of the insured’s interest in avoiding personal exposure. Under Zumwalt, this is precisely the conduct the fiduciary duty is designed to prevent.
Practitioners developing bad faith cases should use the conflict of interest framework explicitly in pleadings and at trial. The jury instruction question is not merely whether the insurer acted reasonably in the abstract—it is whether the insurer gave equal consideration to the insured’s interests when its own interests pointed toward a different decision. Evidence that the insurer’s internal communications focused exclusively on its own exposure, without meaningful analysis of the insured’s personal risk, is powerful proof of fiduciary breach.
Practical Applications for Plaintiff’s Practitioners
For plaintiff’s counsel, the fiduciary duty framework established in Zumwalt and Herman provides a powerful conceptual foundation for bad faith claims. When structuring a consent judgment and assignment arrangement, the assignment document should expressly assign the insured’s claims for breach of fiduciary duty in addition to the statutory vexatious refusal claim under Mo. Rev. Stat. § 375.420 (2023) and any common law bad faith claims. Pleading fiduciary breach alongside these theories ensures that the full scope of the insurer’s obligation to the insured is before the court.
Discovery in fiduciary duty cases should specifically target evidence of the insurer’s internal deliberations about the tension between its own financial exposure and the insured’s personal risk. Reserve histories, supervisor approval chains for settlement decisions, and communications between the claims department and coverage counsel are particularly revealing. An insurer whose internal records show awareness of significant excess exposure combined with a decision to refuse settlement for financial reasons has documented its own fiduciary breach.
Conclusion
Zumwalt v. Utilities Insurance Co. is not a relic of mid-twentieth century insurance law—it is the living foundation of Missouri’s bad faith jurisprudence. Practitioners who ground their coverage and bad faith arguments in the fiduciary framework, cite the controlling authorities accurately, and develop the factual record to demonstrate how the insurer’s conduct violated its utmost good faith obligation will present the strongest possible case for their clients.
