A Toronto man convicted in the brutal 2003 beating death of 15-year-old Terrence Ali has been denied a request to serve out the remainder of his sentence under house arrest.

Justice Russell Otter refused the request because of the seriousness of the crime. The judge's decision brought some relief to the victim's mother, who has attended countless hearings over the years to see justice served to her son's three killers.

"I am emotionally, physically and mentally drained," Moonie Ali said on Thursday. "When I have to attend these things in court, I have to prepare myself emotionally and mentally for it."

The man who applied for the strict supervision term, which would have been served at his parents' house, was 17 days shy of his 18th birthday, and can't be identified under the Youth Criminal Justice Act.

Two others were convicted of murdering Ali after a Caribana party in August 2003. The victim was beaten beyond recognition and then tossed into Lake Ontario, near the Rouge Hill GO train station in Scarborough.

The killer who appeared in court on Thursday will reapply for the supervision term again in June, which could open fresh wounds for Moonie Ali and her family, a friend said.

"They are experiencing trauma and re-traumatization every time they come to this court and have to hear about the crime that was committed to their loved one," said her psychologist and friend Marty McKay.

With a report from CTV Toronto's MairiAnna Bachynsky