R. v. Yager Jr.

R. v. Yager Jr.

Because the defence expert evidence was relevant to the core issue of identity, was potentially exculpatory and its significance was not obvious to lay jurors, the trial judge's complete failure to instruct the jury on assessing that expert evidence was reversible non‑direction; the conviction must be quashed and a...

Source-derived case information.

Citation
C26740
Parties
Respondent: Her Majesty the Queen; Appellant: Joseph John Yager Jr.
Court
Court of Appeal for Ontario
Jurisdiction
Canada
Judgment Date
2 October 1998
Procedural Posture
Criminal / Appeal From Conviction — Court of Appeal Decision
Outcome
Appeal allowed; conviction quashed; new trial ordered.
Legal Topics
Evidence, Expert Evidence, Jury Instructions, Homicide, Identity of Perpetrator
Source Language
en
Criminal Law Evidence Expert Evidence Jury Instructions Homicide Identity of Perpetrator

Source-derived case record

Summary, issues, holding and outcome

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Parties

Her Majesty the Queen

Respondent

Joseph John Yager Jr.

Appellant

Procedural Posture

Criminal / Appeal From Conviction — Court of Appeal Decision

  1. 1 Whether the trial judge's failure to instruct the jury on how to assess expert evidence was reversible error
  2. 2 Admissibility and relevance of competing blood pattern/expert evidence to identity of the killer
  3. 3 Whether defence expert evidence was sufficiently significant and non‑obvious to require specific judicial direction

Ratio Decidendi

Because the defence expert evidence was relevant to the core issue of identity, was potentially exculpatory and its significance was not obvious to lay jurors, the trial judge's complete failure to instruct the jury on assessing that expert evidence was reversible non‑direction; the conviction must be quashed and a new trial ordered.

Court Disposition

Appeal allowed; conviction quashed; new trial ordered.

Orders

  • Appeal allowed
  • Conviction quashed