Terri-Lynne McClintic — who pleaded guilty to first-degree murder in the slaying of Ontario girl Victoria Stafford — has been charged with assault after an alleged fight with another inmate at a prison, her lawyer says.

Geoff Snow told CBC News on Friday that McClintic, 21, is alleged to have been involved in an altercation with Aimee McIntyre, a fellow inmate at Grand Valley Institution for Women in Kitchener, Ont., on Jan. 30.

Both inmates are serving life sentences, he said.

McClintic pleaded guilty to first-degree murder in the Stafford slaying in April 2010 and was sentenced to life in prison with no chance of parole for 25 years.

Eight-year-old Victoria, also known as Tori, went missing April 8, 2009. Her body was found July 19, 2009, in a field in Mount Forest, about 100 kilometres from her hometown.

Snow said he could not discuss the details of the alleged jail assault or what triggered the altercation. Lawyers will be reviewing the Crown's evidence, meeting with McClintic and then will decide what plea to enter, he added.

McClintic will next appear in a Kitchener, Ont., court via video on April 26, he said. 

'She hasn't lost her rights'

He said she's still innocent unless and until proven guilty of the assault.

"In this country, no matter who you are, if you're charged with a crime, you're not convicted until the Crown proves without a reasonable doubt you did it.… She's lost her freedom, no doubt about that, and nothing's going to change that. But she hasn't lost her rights," Snow said.

McClintic has testified at the ongoing trial of her former boyfriend, Michael Thomas Rafferty, who is accused of abducting and sexually assaulting and killing Victoria. Rafferty, 31, has pleaded not guilty.

McClintic testified in March that, while it was Rafferty's idea to abduct Victoria and he sexually assaulted the young girl, said she was the one who delivered the fatal hammer blows. 

McClintic's appearances at the trial in London, Ont., have slightly delayed progress on dealing with the jail assault charges, Snow said.

"At this point, we're reviewing disclosure and the Crown's case, and considering her options," he said.

While it is too early in the case to discuss the outcome, a guilty finding would not add any more prison time to McClintic's sentence, Snow said.

Rafferty trial to hear testimony about DNA tests

Meanwhile, Rafferty's trial is scheduled to continue next week, with the Crown saying testimony about DNA tests on items seized from his home and car will be heard.

The trial heard Thursday that investigators seized a black pea coat and pill bottles from the home Rafferty shared with his mother.

An officer testified that the coat was similar to one Rafferty's ex-girlfriend told police was used to cover Tori in the back seat of Rafferty's car.

With files from The Canadian Press