The accused had an 18-month relationship with the complainant, during which they engaged in unprotected sexual intercourse.
Five months into the relationship, the accused learned he was HIV-positive but failed to disclose this to the complainant.
The complainant later tested positive for HIV.
The Crown conceded it was possible the complainant was infected before the accused learned of his status.
The Supreme Court of Canada held that the accused could not be convicted of aggravated assault because the Crown could not prove beyond a reasonable doubt that his post-knowledge conduct endangered her life, as she was likely already infected.
However, the Court upheld his conviction for attempted aggravated assault, finding he had the requisite intent and took more than preparatory steps.