The Crown appealed from an acquittal on second degree murder and conviction for manslaughter.
The respondent stabbed and killed his girlfriend, admitting to the killing but claiming lack of intent for murder or alternatively acting under provocation.
The jury found him not guilty of murder but guilty of manslaughter.
The Crown advanced two grounds of appeal: whether the trial judge erred in leaving the provocation defence with the jury, and whether expert psychiatric evidence was admissible.
The appellate court dismissed the first ground, finding the Crown could not advance a contradictory position on appeal after accepting provocation was available at trial.
However, the court allowed the appeal on the second ground, finding significant portions of the psychiatrist's evidence regarding the accused's disposition and mental state were inadmissible as they invaded the jury's province and went beyond the proper scope of expert psychiatric opinion.
The court ordered a new trial on the charge of second degree murder.