TORONTO - An inquest into the 2006 murder of an eight-year-old boy by his father during a court-ordered visit will ignore a key expert recommendation to look at the role domestic violence played in his death, NDP critic Andrea Horwath said Thursday.

Horwath said she has learned the inquest, set to begin Monday in Hamilton, won't take into account several factors that Julie Craven, the mother of Jared Osidacz, wants addressed.

"It's very clear that the coroner's inquest is not taking into account a number of factors that I think, and that the Cravens think, are extremely important in regards to what circumstances led to the violent death of Jared," Horwath said.

She will be calling on the government to launch a public inquiry into Jared's death during a news conference Friday to be attended by the boy's mother and grandfather.

A draft of the expert report obtained by The Canadian Press said the inquest must address the role of domestic violence, given the escalation of events leading up Jared's death.

"The impact of domestic violence on children and the risk that children face in potentially lethal circumstances are critical themes that need to be addressed," wrote Peter Jaffe, director of the Centre for Research on Violence Against Women and Children at the University of Western Ontario.

"There are a number of recommendations that the jury could propose that could save children's lives in the future in regards to domestic violence and parenting plans after separation."

Jared "was a vulnerable child who required protection because of escalating risk factors that his father presented from his past marriage and the failure of a new relationship as well as other stressors," Jaffe wrote.

The boy was murdered by Craven's ex-husband Andrew Osidacz during a court-ordered, unsupervised visit that she said should never have been allowed because of the man's history of domestic violence.

After he had fatally stabbed his son, Osidacz was shot dead by police as he held a knife to Craven's throat.

"This is what Julie Craven has been saying all along, that the death of Jared is not some isolated occurrence that has no context at all," Horwath said.

"It has a significant context that has built over years when we know that domestic violence was a part of the experience of Julie, and of Andrew Osidacz and Jared Osidacz."

A law named in part for Jared was passed to make inquests mandatory when a child is killed in court-ordered visits with a parent, but it isn't retroactive, so Jared's case doesn't apply.

Craven has pressed Premier Dalton McGuinty for a stand-alone inquiry into her son's death, saying his refusal so far amounts to a "betrayal" of her son and other children who face court-ordered, unsupervised visits with a parent.

She has argued the public has a right to know how the court system and Children's Aid societies ignored the dangers of her ex-husband having unsupervised access with her son.

Community Safety Minister Rick Bartolucci said Thursday he stands behind Ontario's chief coroner, who decided that only one inquest is needed.

"There's absolutely no question that I believe the chief coroner is in the best position to make that determination," he said.

"An expert in the field is much better than a politician."

The inquest begins a week after Ontario's child and youth advocate released a report stating that 90 children known to Ontario child protection services died in 2007.