The offender was convicted by a jury of second-degree murder for killing his grandfather using a hammer and a dog leash.
The Crown sought a 17-year period of parole ineligibility, while the defence sought 10 years.
The court considered the offender's untreated mental health issues, including schizophrenia, alongside the brutal and unprovoked nature of the attack.
Balancing the aggravating factors and the jury's recommendations against the mitigating factors, the court set the period of parole ineligibility at 15 years.
