Nyasimi v Republic (Criminal Appeal 77 of 2019) [2025] KECA 199 (KLR)
The bottom line
#Kenya's Court of Appeal confirmed a 20-year defilement sentence, ruling DNA evidence is not required for conviction and minimum sentences are constitutional.
What this practically means
#Executive summary
#Questions the Court framed
#The issues the Court set itself to decide, in its own words.
- 1.Whether penetration was proved beyond reasonable doubt in the absence of DNA evidence and despite no spermatozoa being seen
- 2.Whether alleged contradictions and inconsistencies in the prosecution evidence introduced reasonable doubt
- 3.Whether failure to call the complainant's grandmother as a witness entitled the court to draw an adverse inference against the prosecution
- 4.Whether the two courts below violated the appellant's right to a fair trial under Article 50(2) of the Constitution by reason of bias
- 5.Whether the mandatory minimum sentence of twenty years under section 8(3) of the Sexual Offences Act was unconstitutional
Key legal issues
#Proof of penetration without DNA evidence
Penetration was proved beyond reasonable doubt by the complainant's oral testimony corroborated by medical expert evidence; DNA evidence is not a legal prerequisite for conviction in sexual offences
The complainant gave graphic sworn testimony of the assault, and the clinical officer's examination found bruises and epithelial cells, concluding forceful penetrative sex. Section 36(1) of the Sexual Offences Act gives courts a discretion, not a duty, to order DNA testing. Sexual offences are proved by any admissible, cogent and credible evidence, whether oral, medical or scientific; the absence of DNA, spermatozoa, or positive HIV/pregnancy tests does not create reasonable doubt where other credible evidence establishes the offence.
Effect of contradictions in prosecution evidence
The contradictions identified (dates, OB reference numbers, whether the complainant was escorted to hospital) were minor and did not go to the root of the prosecution case or introduce reasonable doubt
The court parsed the trial record and found the discrepancies amounted to trivial errors over dates and reference numbers and a wrong indication about accompaniment to hospital. Such inconsistencies have no bearing on the ingredients of the charge or the substance of the prosecution case; only inconsistencies that overall undermine witness credibility introduce reasonable doubt.
Failure to call the complainant's grandmother as a witness
The inference that an uncalled witness's evidence would have been adverse to the prosecution was not warranted, as the claim was speculative; the grandmother would have added no value to the prosecution case
The High Court had dealt with the Bukenya point comprehensively, finding nothing on record to show PW1 informed her grandmother of the incident, so any evidence she might give about the complainant's condition afterwards was speculative. The Court of Appeal endorsed the learned judge's treatment as eminently correct and added nothing.
Alleged bias and violation of Article 50(2)
The complaint could not be entertained on second appeal because it was not raised in the High Court, and no specific instances of bias were offered
The appellant raised the bias complaint generally and for the first time before the Court of Appeal. A party cannot raise a constitutional violation on second appeal without having litigated it below, and in any event the allegation was unsupported by specific details warranting any finding of bias.
Constitutionality of the mandatory minimum sentence under section 8(3) of the Sexual Offences Act
The twenty-year statutory minimum sentence is constitutional; trial courts have no discretion to impose a sentence below the statutory minimum, per the Supreme Court's binding decision in Republic v Joshua Gichuki Mwangi
Although several High Court and Court of Appeal decisions had held the minimum sentences unconstitutional for constraining judicial discretion, the Supreme Court in Republic v Joshua Gichuki Mwangi held that minimum sentences set the floor, not the ceiling, that Muruatetu addressed only the mandatory death sentence for murder, and that minimum sentences are constitutionally valid. Under Article 163(7) and stare decisis, that decision binds this Court and overrules contrary authority. The twenty-year sentence imposed was therefore lawful.
Legal principles established
#- On a second appeal, the Court of Appeal's jurisdiction is confined to matters of law and it will not interfere with concurrent findings of fact unless based on no evidence, misapprehension of the evidence, or wrong principles
- There is no legal requirement that DNA evidence be presented to secure a conviction in a sexual offence; such offences are proved by any admissible, cogent and credible evidence
- Section 36(1) of the Sexual Offences Act, empowering the court to order DNA or other samples, is not couched in mandatory terms
- Minor or trivial contradictions in prosecution evidence do not weaken the case unless they go to the root of the charge and undermine the credibility of the witnesses
- The only ingredients of defilement requiring proof are penetration, the age of the complainant, and the identity of the perpetrator; consent is irrelevant because minors cannot consent to sexual activity
- Pursuant to Article 163(7) of the Constitution, the Supreme Court's decision in Republic v Joshua Gichuki Mwangi binds the Court of Appeal: mandatory minimum sentences in the Sexual Offences Act are constitutional and trial courts have no discretion to go below the statutory minimum
Court orders
#- 1.The appeal is dismissed in its entirety
- 2.Orders accordingly
The bench
#One judgment of the whole court — no separate or dissenting opinions.
- On appeal from
- High Court of Kenya
- Appeal against conviction and sentence from Ogembo SRM Criminal Case No. 69 of 2017
- Jurisdiction invoked
- Section 361(1) of the Criminal Procedure Code (second appeal limited to matters of law)
Relief refused
#Setting aside of conviction for defilement
Penetration, age and identity were all proved beyond reasonable doubt through the complainant's oral testimony and medical evidence; DNA evidence is not required
Setting aside of the twenty-year sentence
Following the Supreme Court's decision in Republic v Joshua Gichuki Mwangi, the statutory minimum sentence in section 8(3) of the Sexual Offences Act is lawful and binding under the doctrine of stare decisis
Consideration of the alleged violation of Article 50(2) rights
The complaint of bias was raised for the first time on second appeal and no specific instances of bias were offered
Costs
No costs order appears in the judgment.
Quotable passages
#Verbatim from the judgment, each located to the page it appears on in the official PDF — so these can be cited and checked directly.
Consequently, this appeal fails in its entirety. It is hereby dismissed.
There is no requirement that DNA must be availed in order to secure a conviction in a sexual ofience. Sexual ofiences are proved by way of evidence; not just scientific or DNA evidence.
The only three ingredients that requires proof in a defilement charge are: penetration; age of the complainant; and identity of the perpetrator.
Following the doctrine of stare decisis as divined by Article 163(7) of the Constitution, this decision by the Supreme Court is binding on this Court and overrules the recent decisions of this Court holding otherwise.
Our jurisdiction is, therefore, limited to a consideration of matters of law only by dint of section 361(1) of the Criminal Procedure Code.
Issues in the judgment
#The signature block prints 'JUDGE OF APPEAL' an extra time without a corresponding name, apparently a typographical duplication in the certified copy
The judgment does not state the Court of Appeal case number for this second appeal; the case number field must be reconstructed from the trial court reference
Key timeline
#Practical implications
#Frequently asked questions
#Cite this brief
#Cite this brief
Caselaw, "Nyasimi v Republic (Criminal Appeal 77 of 2019) [2025] KECA 199 (KLR)", Case Analysis (2025). Criminal Appeal (not separately numbered in judgment; appeal from Kisii High Court Criminal Appeal arising from Ogembo SRM Criminal Case No. 69 of 2017). Source: https://new.kenyalaw.org/akn/ke/judgment/keca/2025/199/eng@2025-02-07
Suggested citation format for research notes or client memos. Always verify the original judgment before relying on any point.