MACK, Associate Judge:
Appellant, executrix of the estate of decedent Starlin Jasper, appeals from a judgment which awarded $5,105 to appellee based on the decedent’s failure to satisfy child support obligations over the period 1958-1975. We hold that the trial court properly allowed appellee to recover arrear-ages in these payments which had accrued during the child’s minority. However, because the trial court allowed appellee to recover payments which, because of the passage of time, might have been without effect as enforceable money judgments, we vacate the judgment and remand this case for recalculation of the amount to which appellee is entitled.
I.
A 1958 decree of the trial court divorced appellee and the decedent and ordered the decedent to pay appellee ten dollars per week for the support of their minor child. Over the period 1958-1975, when the child reached majority, the decedent substantially failed to meet the child support obligation imposed by this order.1 Appellee filed two motions to enforce the child support order in 1960 but took no further action to assert her rights until after the death of her former husband in 1978. Thereafter in 1980, she filed a claim against his estate seeking recovery of arrearages in the court-ordered support payments.
At trial and in her motion to reconsider, appellant argued that the defense of laches barred this claim based on appellee’s failure to assert her rights until 1980. The trial court denied this defense on the ground that the evidence did not establish that the decedent had relied detrimentally on appel-lee’s delay in enforcing her claims. The court also ruled that the decedent’s estate could not raise this equitable defense because the decedent lacked “clean hands,” having acknowledged his child support obligation by compliance with the court order on numerous occasions, some as late as 1972. The court then computed the total amount of support payments due under the order, subtracted the amount actually paid by decedent, and entered judgment for ap-pellee for the balance.
II.
In Kephart v. Kephart, 89 U.S.App.D.C. 373, 380-81, 193 F.2d 677, 684 (1951) (en banc), cert. denied, 342 U.S. 944, 72 S.Ct. 557, 96 L.Ed. 702 (1952), the United States Court of Appeals held that a trial court
cannot modify or remit installments of alimony after they have become due by the terms of the original judgment which ordered their payment. When a decree awards alimony payable in future installments, the right to each installment becomes absolute and vested when it becomes due, provided no modification of the decree had been made prior to its maturity. Each installment which matures under a decree which has not been modified becomes a judgment debt similar to any other judgment for money. The original decree is final in character with respect to each matured installment and so cannot be challenged [on appeal] and should not be challenged elsewhere. Execution may issue upon it.
This court further clarified the law with respect to enforcement and collection of [48]*48past due court-ordered alimony and child support payments in Lomax v. Spriggs, D.C.App., 404 A.2d 943 (1979). Therein we held, pursuant to Kephart, supra, that
each support payment [becomes] a separate judgment as of the date the payment [falls] due and ... the life of each judgment is the twelve-year period specified in D.C.Code 1973, § 15-101, irrespective of whether the judgments are or are not recorded. As to the life of [each] judgment, § 15-101 specifies that a judgment is in force for twelve years from when “execution might first be issued thereon.” [Lomax, supra at 945.]
Corollary to this holding is the conclusion that, unless an order reviving such a judgment is issued within twelve years of the date on which the court-ordered support payment matures, the judgment “cease[s] to have any operation or effect.” D.C.Code 1973, §§ 15-101(b), -103.
It is true that the defense of lach-es may partially or wholly bar an action to collect past due support payments. Brandt v. Brandt, 107 U.S.App.D.C. 242, 276 F.2d 488 (1960).2 When this equitable defense is raised in an action to collect past due support payments the trial court must therefore determine whether the elements of laches are present, viz., undue delay, unexplained delay, and injustice to the party asserting the defense. See Schmittinger v. Schmittinger, D.C.App., 404 A.2d 967, 970 (1979).
III.
Turning now to consider the instant case, we hold that the trial court correctly applied the law of this jurisdiction in allowing appellee to recover past due child support payments and denying appellant the equitable defense of laches. As the child support payments came due over the period 1958-1975 they matured into money judgments valid for the period of time that this court has held that they may be enforced. See Lomax, supra at 951; Kephart, supra; D.C.Code 1973, § 15-101(b). In evaluating the trial court’s ruling that laches did not bar enforcement of these judgments, we note that “the determination of whether the defense of laches is available is appropriately made by the trial court.” Schmit-tinger, supra at 970 (citing King v. Kitchen Magic, Inc., D.C.App., 391 A.2d 1184 (1978)). We need not consider whether appellee’s delay in enforcing her claims was undue and unexplained nor whether the decedent lacked “clean hands” since we conclude that the trial court correctly ruled that appellant failed to establish that injustice would result from enforcement of the decedent’s support obligations. See generally Annot., 15 A.L.R. 4th 1015, § 6 (1981).
Injustice normally results where the defendant has been prejudiced by the plaintiff’s delay.
[T]here are two kinds of prejudice which would support a defense of laches: where the plaintiff’s delay has resulted in a loss of evidence or unavailability of witnesses that would support defendant’s position; and where the defendant has changed his position in a manner which would not have occurred if the plaintiff had not delayed. [Concerned About Trident v. [49]*49Schlesinger, 400 F.Supp. 454, 478 (D.D.C. 1975), modified, 180 U.S.App.D.C. 345, 555 F.2d 817 (1977) (citations omitted).]
The evidence before the trial court in the instant case revealed that the decedent had failed to satisfy his support obligations to the extent of $5,105 and that, on two occasions during her minority, he gave his daughter cash totalling $110. Appellant thus failed to establish that the decedent changed his position in reliance on appel-lee’s delay in enforcing her claims to such an extent that injustice would result from enforcement at this time. Compare Amidon v. Amidon, D.C.App., 280 A.2d 82
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MACK, Associate Judge:
Appellant, executrix of the estate of decedent Starlin Jasper, appeals from a judgment which awarded $5,105 to appellee based on the decedent’s failure to satisfy child support obligations over the period 1958-1975. We hold that the trial court properly allowed appellee to recover arrear-ages in these payments which had accrued during the child’s minority. However, because the trial court allowed appellee to recover payments which, because of the passage of time, might have been without effect as enforceable money judgments, we vacate the judgment and remand this case for recalculation of the amount to which appellee is entitled.
I.
A 1958 decree of the trial court divorced appellee and the decedent and ordered the decedent to pay appellee ten dollars per week for the support of their minor child. Over the period 1958-1975, when the child reached majority, the decedent substantially failed to meet the child support obligation imposed by this order.1 Appellee filed two motions to enforce the child support order in 1960 but took no further action to assert her rights until after the death of her former husband in 1978. Thereafter in 1980, she filed a claim against his estate seeking recovery of arrearages in the court-ordered support payments.
At trial and in her motion to reconsider, appellant argued that the defense of laches barred this claim based on appellee’s failure to assert her rights until 1980. The trial court denied this defense on the ground that the evidence did not establish that the decedent had relied detrimentally on appel-lee’s delay in enforcing her claims. The court also ruled that the decedent’s estate could not raise this equitable defense because the decedent lacked “clean hands,” having acknowledged his child support obligation by compliance with the court order on numerous occasions, some as late as 1972. The court then computed the total amount of support payments due under the order, subtracted the amount actually paid by decedent, and entered judgment for ap-pellee for the balance.
II.
In Kephart v. Kephart, 89 U.S.App.D.C. 373, 380-81, 193 F.2d 677, 684 (1951) (en banc), cert. denied, 342 U.S. 944, 72 S.Ct. 557, 96 L.Ed. 702 (1952), the United States Court of Appeals held that a trial court
cannot modify or remit installments of alimony after they have become due by the terms of the original judgment which ordered their payment. When a decree awards alimony payable in future installments, the right to each installment becomes absolute and vested when it becomes due, provided no modification of the decree had been made prior to its maturity. Each installment which matures under a decree which has not been modified becomes a judgment debt similar to any other judgment for money. The original decree is final in character with respect to each matured installment and so cannot be challenged [on appeal] and should not be challenged elsewhere. Execution may issue upon it.
This court further clarified the law with respect to enforcement and collection of [48]*48past due court-ordered alimony and child support payments in Lomax v. Spriggs, D.C.App., 404 A.2d 943 (1979). Therein we held, pursuant to Kephart, supra, that
each support payment [becomes] a separate judgment as of the date the payment [falls] due and ... the life of each judgment is the twelve-year period specified in D.C.Code 1973, § 15-101, irrespective of whether the judgments are or are not recorded. As to the life of [each] judgment, § 15-101 specifies that a judgment is in force for twelve years from when “execution might first be issued thereon.” [Lomax, supra at 945.]
Corollary to this holding is the conclusion that, unless an order reviving such a judgment is issued within twelve years of the date on which the court-ordered support payment matures, the judgment “cease[s] to have any operation or effect.” D.C.Code 1973, §§ 15-101(b), -103.
It is true that the defense of lach-es may partially or wholly bar an action to collect past due support payments. Brandt v. Brandt, 107 U.S.App.D.C. 242, 276 F.2d 488 (1960).2 When this equitable defense is raised in an action to collect past due support payments the trial court must therefore determine whether the elements of laches are present, viz., undue delay, unexplained delay, and injustice to the party asserting the defense. See Schmittinger v. Schmittinger, D.C.App., 404 A.2d 967, 970 (1979).
III.
Turning now to consider the instant case, we hold that the trial court correctly applied the law of this jurisdiction in allowing appellee to recover past due child support payments and denying appellant the equitable defense of laches. As the child support payments came due over the period 1958-1975 they matured into money judgments valid for the period of time that this court has held that they may be enforced. See Lomax, supra at 951; Kephart, supra; D.C.Code 1973, § 15-101(b). In evaluating the trial court’s ruling that laches did not bar enforcement of these judgments, we note that “the determination of whether the defense of laches is available is appropriately made by the trial court.” Schmit-tinger, supra at 970 (citing King v. Kitchen Magic, Inc., D.C.App., 391 A.2d 1184 (1978)). We need not consider whether appellee’s delay in enforcing her claims was undue and unexplained nor whether the decedent lacked “clean hands” since we conclude that the trial court correctly ruled that appellant failed to establish that injustice would result from enforcement of the decedent’s support obligations. See generally Annot., 15 A.L.R. 4th 1015, § 6 (1981).
Injustice normally results where the defendant has been prejudiced by the plaintiff’s delay.
[T]here are two kinds of prejudice which would support a defense of laches: where the plaintiff’s delay has resulted in a loss of evidence or unavailability of witnesses that would support defendant’s position; and where the defendant has changed his position in a manner which would not have occurred if the plaintiff had not delayed. [Concerned About Trident v. [49]*49Schlesinger, 400 F.Supp. 454, 478 (D.D.C. 1975), modified, 180 U.S.App.D.C. 345, 555 F.2d 817 (1977) (citations omitted).]
The evidence before the trial court in the instant case revealed that the decedent had failed to satisfy his support obligations to the extent of $5,105 and that, on two occasions during her minority, he gave his daughter cash totalling $110. Appellant thus failed to establish that the decedent changed his position in reliance on appel-lee’s delay in enforcing her claims to such an extent that injustice would result from enforcement at this time. Compare Amidon v. Amidon, D.C.App., 280 A.2d 82 (1971) (detrimental reliance was established and operated to bar action by mother to collect past due child support payments where father financed education of child in private institutions and could not have done so had he paid court-ordered child support). Similarly, we find no merit in appellant’s argument that the death of Starlin Jasper has resulted in the loss of evidence and a witness who would support her position. Court records before the trial court established the extent of the decedent’s compliance with the order, and the testimony of the decedent’s daughter concerning the monetary gifts she received from her father during her minority was consistent with appellant’s testimony on this subject. Appellant did not contend at trial that court records failed to reflect all of the decedent’s child support payments, nor did she proffer that the decedent made independent monetary payments or gifts to appellee or the child which she was unable to prove because of his inability to testify at trial. A merely speculative possibility that evidence or testimony which would support appellant’s position was lost or unavailable due to appel-lee’s delay in enforcing her claims is insufficient to establish the type of prejudice which would merit the application of lach-es.3
However, we find that the trial court allowed appellee to collect past due payments which matured more than twelve years before suit was filed in the instant case which, therefore, had expired and ceased to have effect. See Lomax, supra at 951; D.C.Code 1973, § 15-101(b). Accordingly, we vacate the judgment and remand this matter for a recalculation of the amount which appellee may collect.4
Vacated and remanded.