The Supreme Court of Canada will rule Thursday on whether Guy Turcotte should be tried again for the murder of his two children in 2009.
Turcotte, a former cardiologist, stabbed his children to death, admitted he had done it but was found not criminally responsible because of his mental state at the time.
Last fall, the Quebec Court of Appeal overturned the verdict and ordered a new trial saying the lower court judge had made several errors in law.
The Supreme Court will also rule on Thursday on whether semi-retired Federal Court of Appeal Judge Marc Nadon is eligible to become a Supreme Court justice.
Nadon's status has been in limbo since last fall when he was named to the Supreme Court by Prime Minister Harper.
A constitutional lawyer from Toronto and the Quebec government oppose the appointment arguing that Quebec appointments to the high court must come from either the Quebec Court of Appeal or the Quebec Superior Court.
Nadon has also not practised in Quebec for 20 years.