OPALA, Vice Chief Justice.
Two issues are tendered for our decision in this second appeal from denial of a hospital’s quest that payment be ordered for the decedent’s last illness expenses without a timely statutory creditor’s claim:2 [1] Does Oklahoma law charge the estate representative with knowledge that the hospital where the decedent died as a paying patient was a potential creditor of the estate? and if so [2] Did the hospital effectively relinquish that which was its constitutional due — actual notice under Oklahoma’s nonclaim statute? We answer the first question in the affirmative and the second in the negative.
THE ANATOMY OF LITIGATION
The trial court denied the hospital’s application for payment of decedent’s last illness expenses, which was pressed without an antecedent and timely statutory creditor’s claim.3 We affirmed its order on appeal.4 The U.S. Supreme Court vacated this court’s decision on certiorari and re[642]*642manded the cause5 for a factual inquiry into the publication service’s sufficiency as notice to the hospital — conformable to the minimum standards of due process — of the time after which the hospital’s claim against the estate would be barred. We ordered the district court to carry out the federal court’s mandate,6 and that court denied the relief sought, implicitly holding service by publication was constitutionally sufficient, and the hospital’s quest for payment untimely. The hospital once again appeals.
I THE MINIMUM STANDARDS OF NOTICE UNDER THE DUE PROCESS CLAUSE OF THE 14TH AMENDMENT
No state may deprive a person of property without due process, commands the Fourteenth Amendment.7 Since the landmark case of Mullane v. Central Hanover Bank & Trust Co.,8 the U.S. Supreme Court has required that notice meeting minimum constitutional standards precede judicial action which affects a protected property interest. Notice must be reasonably calculated to inform interested parties of the pending action and of every critical stage so as to afford them an opportunity to defend9 or to meet the issues at a meaningful time and in a meaningful manner.10
Under Mullane and its progeny, one who seeks to alter another’s legal rights must give actual notice to the latter before a court can act upon the claim. In Mullane ⅛ aftermath the Court held that publication notice is insufficient to inform a known creditor that the latter’s claim would be barred in bankruptcy unless filed within a statutory period.11 The Court next elaborated on its Mullane mandate in Walker v. City of Hutchinson,12 where it held that [643]*643actual notice must be given in state proceedings which “directly and adversely affect” a protected property interest. Notice of condemnation proceedings published in a local newspaper was pronounced insufficient vis-a-vis the landowner whose name and address the city knew, or should have learned, from the official county records. The Court further amplified this message in Schroeder v. City of New York.13 There it concluded that posted and published notice of condemnation proceedings is inadequate to afford the landowners an opportunity to defend against the loss of their rights in land. Actual notice, the Court opined, is due all “known or very easily ascertainable” parties. In Greene v. Lindsey 14 the Court condemned the posting of a summons on a tenant’s apartment door as constitutionally substandard notice of forcible entry and detainer — when an “inexpensive and efficient mechanism such as mail service is available.” In Mennonite Board of Missions v. Adams15 the Court continued refining Mullane. There, mortgagees received notice of a tax sale by publication alone. The Court held that “a mortgagee’s knowledge of delinquency in the payment of taxes is not equivalent to notice that a tax sale is pending.” 16 (Emphasis added.) The state’s failure to provide the mortgagee with actual notice of the tax sale violates due process, because “reasonably diligent efforts” could have identified the mortgagee and ascertained its address.17
The Court’s teaching in Pope18 directly applies Mullane to probate proceedings.19 [644]*644Its pronouncement places on the estate representative an affirmative duty to make “reasonably diligent efforts” to uncover the identity of estate creditors and to ascertain their whereabouts for actual notice which would inform them of the time to file claims against the estate.20
MULLANE’S IMPACT ON OKLAHOMA’S NOTICE SCHEME
Some thirty years after Mullane, Oklahoma litigants were still required to protect their interest by monitoring court dockets during critical litigation stages. If an ap-pealable decision was rendered in absentia and without notice to the defeated litigant, the unsuccessful party was nonetheless bound by its terms if he failed to learn of them in time to bring an appeal within the statutorily prescribed time. Implementing the standards and spirit of Mullane as well as of its progeny, this court expressly condemned in McCullough v. Safeway21 “as clearly in discord with the notions of due process, state and federal” the then obtaining notion of duty to monitor the court’s docket for appealable events that might occur in absentia when the case was under advisement and not regularly set on the docket for pronouncement of the court’s decision.
Under an earlier version of railroad22 and highway condemnation statutes,23 the time for filing an exception or demand for trial by jury ran 60 days from the date the clerk would file the commissioner’s report of valuation. In those cases the landowner similarly had the duty to monitor the docket for the appearance of the critical report and then count 60 days for computing the terminal day. The due process notions counseled by the dissenting opinion in State ex rel. Department of Highways v. Brown24 finally led to legislative amendments of the pertinent condemnation statutes. The enactments now provide that in eminent domain cases actual notice of the filing of the commissioner’s report must be given. The legislature itself relieved the condemnee-landowner of the once-borne duty to monitor a court docket. It placed the onus of notice giving on the party who [645]*645seeks adversely to affect the condemnee’s title to property.25
Our pre-Pope practice similarly required a decedent’s creditor to monitor the court’s docket for the earliest paper trail of instituted probate proceedings. Absent from our statutory and case law was the very notion that the estate representative must use diligence to ascertain the potential creditors’ identity as well as their whereabouts for compliance with the minimum standards of due process. Post-Pope
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OPALA, Vice Chief Justice.
Two issues are tendered for our decision in this second appeal from denial of a hospital’s quest that payment be ordered for the decedent’s last illness expenses without a timely statutory creditor’s claim:2 [1] Does Oklahoma law charge the estate representative with knowledge that the hospital where the decedent died as a paying patient was a potential creditor of the estate? and if so [2] Did the hospital effectively relinquish that which was its constitutional due — actual notice under Oklahoma’s nonclaim statute? We answer the first question in the affirmative and the second in the negative.
THE ANATOMY OF LITIGATION
The trial court denied the hospital’s application for payment of decedent’s last illness expenses, which was pressed without an antecedent and timely statutory creditor’s claim.3 We affirmed its order on appeal.4 The U.S. Supreme Court vacated this court’s decision on certiorari and re[642]*642manded the cause5 for a factual inquiry into the publication service’s sufficiency as notice to the hospital — conformable to the minimum standards of due process — of the time after which the hospital’s claim against the estate would be barred. We ordered the district court to carry out the federal court’s mandate,6 and that court denied the relief sought, implicitly holding service by publication was constitutionally sufficient, and the hospital’s quest for payment untimely. The hospital once again appeals.
I THE MINIMUM STANDARDS OF NOTICE UNDER THE DUE PROCESS CLAUSE OF THE 14TH AMENDMENT
No state may deprive a person of property without due process, commands the Fourteenth Amendment.7 Since the landmark case of Mullane v. Central Hanover Bank & Trust Co.,8 the U.S. Supreme Court has required that notice meeting minimum constitutional standards precede judicial action which affects a protected property interest. Notice must be reasonably calculated to inform interested parties of the pending action and of every critical stage so as to afford them an opportunity to defend9 or to meet the issues at a meaningful time and in a meaningful manner.10
Under Mullane and its progeny, one who seeks to alter another’s legal rights must give actual notice to the latter before a court can act upon the claim. In Mullane ⅛ aftermath the Court held that publication notice is insufficient to inform a known creditor that the latter’s claim would be barred in bankruptcy unless filed within a statutory period.11 The Court next elaborated on its Mullane mandate in Walker v. City of Hutchinson,12 where it held that [643]*643actual notice must be given in state proceedings which “directly and adversely affect” a protected property interest. Notice of condemnation proceedings published in a local newspaper was pronounced insufficient vis-a-vis the landowner whose name and address the city knew, or should have learned, from the official county records. The Court further amplified this message in Schroeder v. City of New York.13 There it concluded that posted and published notice of condemnation proceedings is inadequate to afford the landowners an opportunity to defend against the loss of their rights in land. Actual notice, the Court opined, is due all “known or very easily ascertainable” parties. In Greene v. Lindsey 14 the Court condemned the posting of a summons on a tenant’s apartment door as constitutionally substandard notice of forcible entry and detainer — when an “inexpensive and efficient mechanism such as mail service is available.” In Mennonite Board of Missions v. Adams15 the Court continued refining Mullane. There, mortgagees received notice of a tax sale by publication alone. The Court held that “a mortgagee’s knowledge of delinquency in the payment of taxes is not equivalent to notice that a tax sale is pending.” 16 (Emphasis added.) The state’s failure to provide the mortgagee with actual notice of the tax sale violates due process, because “reasonably diligent efforts” could have identified the mortgagee and ascertained its address.17
The Court’s teaching in Pope18 directly applies Mullane to probate proceedings.19 [644]*644Its pronouncement places on the estate representative an affirmative duty to make “reasonably diligent efforts” to uncover the identity of estate creditors and to ascertain their whereabouts for actual notice which would inform them of the time to file claims against the estate.20
MULLANE’S IMPACT ON OKLAHOMA’S NOTICE SCHEME
Some thirty years after Mullane, Oklahoma litigants were still required to protect their interest by monitoring court dockets during critical litigation stages. If an ap-pealable decision was rendered in absentia and without notice to the defeated litigant, the unsuccessful party was nonetheless bound by its terms if he failed to learn of them in time to bring an appeal within the statutorily prescribed time. Implementing the standards and spirit of Mullane as well as of its progeny, this court expressly condemned in McCullough v. Safeway21 “as clearly in discord with the notions of due process, state and federal” the then obtaining notion of duty to monitor the court’s docket for appealable events that might occur in absentia when the case was under advisement and not regularly set on the docket for pronouncement of the court’s decision.
Under an earlier version of railroad22 and highway condemnation statutes,23 the time for filing an exception or demand for trial by jury ran 60 days from the date the clerk would file the commissioner’s report of valuation. In those cases the landowner similarly had the duty to monitor the docket for the appearance of the critical report and then count 60 days for computing the terminal day. The due process notions counseled by the dissenting opinion in State ex rel. Department of Highways v. Brown24 finally led to legislative amendments of the pertinent condemnation statutes. The enactments now provide that in eminent domain cases actual notice of the filing of the commissioner’s report must be given. The legislature itself relieved the condemnee-landowner of the once-borne duty to monitor a court docket. It placed the onus of notice giving on the party who [645]*645seeks adversely to affect the condemnee’s title to property.25
Our pre-Pope practice similarly required a decedent’s creditor to monitor the court’s docket for the earliest paper trail of instituted probate proceedings. Absent from our statutory and case law was the very notion that the estate representative must use diligence to ascertain the potential creditors’ identity as well as their whereabouts for compliance with the minimum standards of due process. Post-Pope legislation has now cast on the estate representative an affirmative duty to protect “reasonably ascertainable creditors” by giving them actual notice of the time after which claims against the estate would be barred.26
II STATE-LAW STANDARDS FOR ASSESSING THE QUANTUM OF DILIGENCE THE ESTATE REPRESENTATIVE MUST USE TO IDENTIFY POTENTIAL CREDITORS
On the scanty record before it, the U.S. Supreme Court declined in Pope to determine initially whether the estate representative was less than diligent in failing to identify the hospital as a potential creditor. The cause was remanded for a factual probe.27 Pope neither guided nor attempted to preempt state law by imposing articulated federal norms for measuring the quantum of diligence required of an estate representative to identify persons or entities with likely creditor status vis-a-vis a decedent’s estate so that these persons may be afforded the quality of notice that is their constitutional due.28 Once a person has been so identified, federal law determines the process of diligence in ascertaining the affected entity’s last whereabouts for notice of the pendency of proceedings to be given at a meaningful time and in a meaningful manner.29 We hence fashion today state-law standards to govern the degree of diligence an estate representative must use when making “reasonably diligent efforts ... to uncover the identities of [potential] creditors.”30
The estate representative must use due [646]*646diligence31 to identify the decedent's potential creditors from all available sources at hand. We need not concretize these norms by resort to extra-statutory sources. The law’s expected degree of diligence is that defined in 25 O.S.1981 §§ 10-13.32
Under state-law standards an estate representative who knows of a decedent’s last-illness hospital stay as a paying patient is put on notice by the provisions of 25 O.S. 1981 §§ 11-13 that the health care provider is likely to stand, vis-a-vis the decedent’s estate, in the status of a creditor. It is then the estate representative’s state-law duty to give actual notice to all such creditor entities whose whereabouts are reasonably ascertainable. Upon discharging this obligation, the estate representative bears no further responsibility to inquire into the exact amount of the claim, if any there be; that burden shifts to the potential creditor who must file and prove a claim for a stated sum. By giving actual notice to every ascertainable creditor-claimant, the representative not only satisfies state-law duty but also meets the minimum standards of due process mandated by Mennonite, Schroeder, Greene, Manzo and Peralta.33
Ill STANDARD OF REVIEW
Probate proceedings are of equitable cognizance.34 While an appellate court will examine and weigh the proof in the record, it must abide by the law’s presumption that the decision is legally correct 35 and cannot be disturbed unless found to be clearly contrary to the weight of the evidence or to some governing principle of law.36 If legally correct, the ruling may not be reversed because of the lower court’s faulty reasoning, erroneous finding of fact or its consideration of an immaterial issue.
IV BASED ON OKLAHOMA STATE-LAW STANDARDS OF DILIGENCE, THE ESTATE REPRESENTATIVE, WHEN GIVING PUBLICATION NOTICE ALONE, COULD HAVE ASCERTAINED FROM PERSONAL KNOWLEDGE AND FROM AVAILABLE SOURCES AT HAND THAT THE HOSPITAL WAS A LIKELY DECEDENT’S CREDITOR
On this record the executrix was clearly aware that during her husband’s last illness he had been a paying patient in the hospital for over four months prior to his death. She also knew that the decedent had medical insurance and that the hospital had been processing the decedent’s bills through his risk carrier.
[647]*647As Oklahoma statutes37 clearly require, we must infer from these facts within her knowledge that the estate representative could have ascertained from her personal knowledge and on further inquiry from available sources at hand that, when she caused publication notice to be given, the hospital was likely to become a creditor-claimant against the decedent’s estate. That knowledge alone was enough to entitle the hospital to actual notice of the terminal date after which claims against the estate would be barred. Once an individual has been ascertained as a likely creditor, it is irrelevant — for notice-giving purposes — that the exact amount of the claim, if there indeed was one, cannot be computed and hence remains uncertain. The dollar figure becomes an issue only after the creditor has pressed a claim against the estate.38
In short, the executrix failed in her duty to treat the hospital — a known health care provider during the decedent’s last illness — as a likely or ascertainable creditor and to give it actual notice of the statutory period for submission of claims. The hospital was hence deprived of a constitutionally protectible opportunity to press its demands by proving a claim.
V THE HOSPITAL’S ACTS OR CONDUCT DID NOT WAIVE ITS CONSTITUTIONAL RIGHT TO NOTICE
Unless the hospital waived its status as a creditor of the decedent’s estate, thus relinquishing its constitutional right to actual notice, the executrix’ constitutionally infirm notice (by publication alone) violates the minimum standards of due process. A waiver is the voluntary or intentional relinquishment of a known right.39
The hospital attained the status of decedent’s creditor when he was admitted for services as a paying patient. When probate proceedings were filed, the hospital became a likely claimant against the decedent’s estate. At the critical time when notice to creditors was given solely by publication, the executrix stood charged with knowing facts from which she could infer the hospital’s status as a likely or ascertainable creditor-claimant.
The executrix seems to have urged below that the hospital’s failure to communicate with her about the status of its bill during and after the decedent’s stay in that facility operates to relieve her of the duty to give notice. She did not recall ever receiv[648]*648ing a hospital bill. She seems to urge that even if she had inquired about the bill that was due, the hospital could not have told her then if a demand would be forthcoming since a claim against the decedent's insurance was still being pressed.
The record does not support a conclusion that the hospital, by its acts or conduct, voluntarily or intentionally waived its status as creditor or its due process right to notice. Nothing in the hospital’s acts demonstrates relinquishment of its constitutionally mandated right to actual notice of the time to file a claim. Neither does the hospital’s assignment of its claim to another, more than two years after publication notice, bears indicia of a fundamental right’s relinquishment. Rather, the subsequent assignment eloquently demonstrates that the hospital believed its claim for decedent’s last illness expenses was still viable. We hence conclude the hospital did not effectively waive its status as creditor of the decedent’s estate when notice to creditors was published. Because no actual notice was given, the hospital failed to receive the process that was its constitutional due.40
SUMMARY
The trial court’s probate order under review is clearly contrary to the weight of the evidence and to the governing principles of the applicable state and federal law. It is accordingly reversed; the cause is remanded with directions to find that the hospital’s claim for the decedent’s expenses of stay and treatment during his last illness cannot be rejected as untimely pressed because the hospital failed to receive actual notice of the time to file a claim — its sine qua non constitutional due under the circumstances shown by the record. On remand the trial court shall direct that the estate representative consider the claim as timely and act upon it in compliance with the applicable procedure of the Probate Code.
THE TRIAL COURT’S ORDER IN PROBATE IS REVERSED AND CAUSE REMANDED FOR FURTHER PROCEEDINGS WITH DIRECTIONS.
HARGRAVE, C.J., and HODGES, SIMMS, DOOLIN and KAUGER, JJ., concur.
ALMA WILSON, J., concurs specially.
LAVENDER and SUMMERS, JJ., concur in judgment.