High Court Declares Mandatory Indefinite Life Imprisonment Unconstitutional, Substituting 35-Year Sentence on Dignity and Equality Grounds

The High Court's Constitutional and Human Rights Division has struck down mandatory life imprisonment without parole as unconstitutional, finding that an indefinite sentence with no prospect of release contravenes Articles 28 and 25 of the Constitution of Kenya, 2010, which protect human dignity and prohibit inhuman and degrading treatment. The ruling arose from a petition by John Ndachu Nganga, convicted of defilement in 2014 under Section 8(2) of the Sexual Offences Act, who had exhausted both High Court and Court of Appeal appellate avenues before approaching the Constitutional division. Justice Mshila substituted the life sentence with a 35-year definite custodial term calculated from the 2013 conviction date. The state filed no submissions. The ruling creates a directly applicable precedent for constitutional challenges to mandatory life sentences across Kenya's criminal statute book, and it raises a structural question about any provision that removes judicial sentencing discretion entirely through mandatory minimums that amount to indefinite imprisonment.

Nganga's route to this ruling is procedurally significant. He had already been through the full appellate chain, the High Court and Court of Appeal both dismissed his appeals, before approaching the Constitutional and Human Rights Division on constitutional grounds distinct from the factual and legal grounds previously argued. The Constitutional division accepted jurisdiction and found a constitutional issue that neither the trial court nor the appellate courts had addressed, namely whether the sentence itself, regardless of the validity of the conviction, violated constitutional rights. That procedural pathway is now an established route for similarly situated prisoners who have exhausted conventional appeals but hold constitutional arguments against the nature of their sentence rather than their conviction.

The state's decision not to file written submissions is an unusual feature of this ruling that limits its adversarial testing. Justice Mshila's findings stand without a counter-argument from the prosecution, which means the constitutional reasoning in the judgment, while binding as precedent, has not been tested against the state's strongest possible defence of mandatory sentencing provisions. That matters for how robustly the precedent will hold under scrutiny from the prosecution side in future cases, and it is likely to be a ground on which the Director of Public Prosecutions may seek to distinguish or appeal the ruling.

Section 8(2) of the Sexual Offences Act, No. 3 of 2006, prescribes life imprisonment as the mandatory minimum sentence for defilement of a child. The provision removes sentencing discretion from the trial court where the prescribed sentence is mandatory, requiring the imposition of life imprisonment regardless of individual circumstances, mitigating factors, or the offender's personal history. The constitutional challenge rests on Articles 28 and 25 of the Constitution of Kenya, 2010. Article 28 guarantees every person inherent dignity and the right to have that dignity respected and protected. Article 25 lists rights that cannot be limited under any circumstances, including the right to be free from torture and cruel, inhuman, or degrading treatment. Justice Mshila found that an indefinite sentence with no temporal horizon and no prospect of release crosses the threshold into treatment that the Constitution prohibits absolutely.

Kenyan courts have been moving in this direction for some time. The Supreme Court's 2017 decision in Francis Muruatetu v Republic struck down mandatory death sentences as unconstitutional on similar dignity grounds, finding that the removal of judicial discretion in capital sentencing was incompatible with Articles 28 and 25. That decision opened a significant wave of sentence review applications from prisoners on death row and has been cited in subsequent challenges to other mandatory minimum provisions. The present ruling applies the same constitutional logic to mandatory life imprisonment, extending the Muruatetu principle beyond capital punishment to the next category of most severe sentence in Kenya's criminal law.

The Muruatetu parallel is the most important doctrinal element of this ruling. When the Supreme Court struck down mandatory death sentences in 2017, it created a principle that the removal of judicial sentencing discretion through mandatory provisions is constitutionally suspect where the sentence is of sufficient severity to engage dignity and anti-torture rights. Justice Mshila's application of that principle to mandatory life imprisonment is a logical extension, since life imprisonment without parole shares with the death penalty the characteristic of irreversibility and the complete absence of any prospect of release, rehabilitation, or reintegration. The 35-year substitute sentence itself is significant: it is a very long sentence that reflects the severity of the offence, but it is a defined term with a calculable end date, which is what the constitutional analysis requires, the possibility of release, not the probability of early release.

The implications for prisoners currently serving mandatory life sentences under Section 8(2) of the Sexual Offences Act and other provisions prescribing mandatory life terms are immediate and practical. This ruling, following the Muruatetu pattern, is likely to generate a wave of sentence review applications from prisoners in Nganga's position, those who have exhausted appellate avenues on conviction grounds but have not previously raised a constitutional challenge to the nature of the sentence itself. Criminal defence practitioners should immediately identify clients or former clients serving mandatory life sentences who have not yet brought constitutional sentencing challenges, since the procedural pathway is now clearly established. The statute of limitations question for constitutional petitions of this nature, and whether it applies to prisoners who have been serving their sentences for many years, will also need to be addressed as applications come in.

The structural question for prosecutors and the legislature is whether mandatory minimum provisions across Kenya's criminal statute book are now comprehensively exposed to constitutional challenge wherever they remove discretion entirely and impose either indefinite or extremely long sentences. The Sexual Offences Act, the Narcotic Drugs and Psychotropic Substances Act, and various other statutes contain mandatory minimum provisions of different severity. Not all mandatory minimums will fail constitutional scrutiny, since the court's reasoning specifically targets the indefinite and irreversible character of life imprisonment without parole rather than mandatory minimums generally. A mandatory minimum of five or ten years, while it also removes discretion, does not raise the same dignity and inhuman treatment analysis as a sentence with no fixed endpoint. The line between constitutionally permissible mandatory minimums and impermissible ones will be drawn through the litigation that follows this ruling, and practitioners on both sides need to understand where that line is likely to fall.

This ruling applies the constitutional logic of Muruatetu to mandatory life imprisonment and is likely to have comparable systemic consequences. Any mandatory sentence that removes judicial discretion entirely and results in indefinite imprisonment is now constitutionally exposed. Criminal defence practitioners should be moving on this immediately for eligible clients. Parliament should be moving on it legislatively before the courts are asked to draw the constitutional line provision by provision across Kenya's entire mandatory sentencing statute book.