WHITEHEAD v. CORNERSTONE RX, LLC and HUENERGARDT

CourtCourt of Civil Appeals of Oklahoma
DecidedMay 7, 2026
Docket122899
StatusPublished

This text of WHITEHEAD v. CORNERSTONE RX, LLC and HUENERGARDT (WHITEHEAD v. CORNERSTONE RX, LLC and HUENERGARDT) is published on Counsel Stack Legal Research, covering Court of Civil Appeals of Oklahoma primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
WHITEHEAD v. CORNERSTONE RX, LLC and HUENERGARDT, (Okla. Ct. App. 2026).

Opinion

OSCN Found Document:WHITEHEAD v. CORNERSTONE RX, LLC and HUENERGARDT

WHITEHEAD v. CORNERSTONE RX, LLC and HUENERGARDT
2026 OK CIV APP 16
Case Number: 122899
Decided: 05/07/2026
Mandate Issued: 06/04/2026
COURT OF CIVIL APPEALS OF THE STATE OF OKLAHOMA, DIVISION II


Cite as: 2026 OK CIV APP 16, __ P.3d __


LORA WHITEHEAD, as Personal Representative of the Estate of Kyle Whitehead, Deceased, and as Substitute Managing Member of CORNERSTONE RX, LLC, Plaintiff/Appellee,
vs.
CORNERSTONE RX, LLC; and GREGORY S. HUENERGARDT, as Managing Member of CORNERSTONE RX, LLC, Defendants/Appellants.

APPEAL FROM THE DISTRICT COURT OF
ELLIS COUNTY, OKLAHOMA

HONORABLE DONNA L. DIRICKSON, TRIAL JUDGE

AFFIRMED

Julia C. Rieman, Dustin E. Conner, April M. Davis, GUNGOLL, JACKSON, BOX & DEVOLL, P.C., Enid, Oklahoma, For Plaintiff/Appellee

Katresa J. Riffel, Matthew C. Russell, RIFFEL, RIFFEL & BENHAM, PLLC, Enid, Oklahoma, For Defendants/Appellants

STACIE L. HIXON, CHIEF JUDGE:

¶1 Defendants Cornerstone RX, LLC (Cornerstone) and Gregory S. Huenergardt appeal an order of the trial court disqualifying the law firm of Riffel, Riffel, and Benham, PLLC (Riffel Firm) from representing them in a suit filed by Lora Whitehead (Lora), as personal representative of the Estate of Kyle Whitehead (Estate). Huenergardt and decedent Kyle Whitehead (Whitehead) were equal members of Cornerstone. Cornerstone itself, as well as Huenergardt and Whitehead, were represented by attorney Craig Riffel. After Whitehead died, Estate alleged Huenergardt attempted to cut Estate out of Cornerstone and begin a new company set up by Riffel to continue Cornerstone's business. Whitehead's wife, Lora, filed suit on behalf of Estate against Huenergardt for breach of fiduciary duty and violation of the operating agreement and requested an accounting from Cornerstone.

¶2 After Riffel and other attorneys for the Riffel Firm entered their appearance on behalf of Huenergardt and Cornerstone, respectively, Estate moved to disqualify Riffel and the Riffel Firm from representing either in the pending litigation due to conflict of interest. Riffel withdrew. Following hearing, the trial court disqualified the Riffel Firm from further representation in the pending suit, finding an attorney-client relationship between Riffel and Whitehead, that the litigation involved a matter substantially related to Riffel's prior representation of Whitehead, and that the interests of the Riffel Firm's present client were adverse to Estate. On review of the record and the briefing on appeal, we affirm the trial court's Order of February 14, 2025, disqualifying the Riffel Firm from further representation in the underlying suit.

BACKGROUND

¶3 Whitehead and Huenergardt were pharmacists who formed a limited liability company, Cornerstone, as an alleged buying group used to obtain favorable prices for pharmaceuticals.

¶4 Riffel represented Whitehead, Lora, and Huenergardt on personal or business matters apart from Cornerstone. He also represented Whitehead and Huenergardt in their formation of Cornerstone and served as Cornerstone counsel thereafter. According to Lora, Riffel was also working with Whitehead and Huenergardt to set up a new entity or group purchasing organization because one of Cornerstone's drug suppliers was not willing to do business with Cornerstone under its current structure. Before this was completed, Whitehead died in March 2023.

¶5 Lora is personal representative of Whitehead's Estate. She also contends that under the operating agreement, she has succeeded or will succeed to Whitehead's 50% interest in Cornerstone as a substitute member by terms of the operating agreement and testamentary disposition.

¶6 Lora filed suit on behalf of Estate, asserting claims for breach of fiduciary duty and breach of the operating agreement against Huenergardt and a claim for an accounting against Cornerstone. Riffel moved to dismiss those claims on behalf of Cornerstone. Another attorney from the Riffel Firm, Matthew Russell, filed a Motion to Dismiss on behalf of Huenergardt. Thereafter, Estate moved to disqualify Riffel and the Riffel Firm. It asserted, among other things, that Riffel had currently and formerly represented Cornerstone as well as Whitehead in matters relating to the formation of Cornerstone, as well as the new entity, which was substantially related to the subject matter of Riffel's representation of Cornerstone and Huenergardt in Estate's suit.

¶7 In response, Cornerstone and Huenergardt collectively argued that the appropriate consideration was whether the Riffel Firm had represented Lora personally. Defendants did not dispute that Riffel had represented Lora, but contended the matters were not substantially related.

¶8 The trial court conducted a hearing on the Motion to Disqualify on January 14, 2025. Lora and Riffel testified. Some of the testimony concerned Riffel's representation of Lora on unrelated matters, which Riffel argued during the hearing did not preclude representation of Cornerstone or Huenergardt. He also contended he did not have confidential information he or his firm could use against Estate in its dispute with Cornerstone or Huenergardt, negating any conflict. It was undisputed that he set up Cornerstone for Huenergardt and Whitehead and acted as Cornerstone's corporate counsel. Likewise, Riffel did not dispute that, prior to Whitehead's death, he and Huenergardt were looking to change the form of Cornerstone or establish a new entity to serve Cornerstone's business.

¶9 The trial court explained at the hearing that the issue was not whether Riffel had previously represented Lora. Rather, the court explained:

Lora Whitehead is standing in the shoes, for lack of a better phraseology, of Kyle Whitehead because she is the personal representative of his estate at this time.

***

So if we back up and look at this case in a scenario of Greg and Kyle have worked with Craig . . . over the years and you've done some business things together and by the very fact that there's billing statements, he has continued to counsel Greg as part owner of [Cornerstone]. So if we look at this case as Kyle and Greg get into a tiff and have a disagreement and they need to sue each other, I don't think anybody in here would say well, Craig can decide which one of those two he wants to represent and the other one has to go get an attorney. That is a standard conflict of interest.
And any time--there's other type of case where at first an attorney is representing two or three or four parties, but when they become in conflict with each other, that attorney must bow out and cannot represent anyone. And that is the light in which this Court has viewed this case and is looking at the elements of the statements of Rule 1.9, which is a conflict of interest.
And I note that both sides kept talking to me about confidential information. I don't think it hinges on whether or not there's confidential information, but I do think it hinges on material information and there can be no doubt that Mr. Riffel has vast material information about the workings of [Cornerstone] based on his testimony that he gave here today. And he has continued to counsel Greg on issues that pertain to it going forward or possibly pertain to it being dissolved.

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WHITEHEAD v. CORNERSTONE RX, LLC and HUENERGARDT, Counsel Stack Legal Research, https://law.counselstack.com/opinion/whitehead-v-cornerstone-rx-llc-and-huenergardt-oklacivapp-2026.