The British government has come under renewed pressure to hold a public inquiry into the 1989 murder of solicitor Pat Finucane.
Canadian politicians have signed a petition calling for a probe into one of six murders in which an independent former judge found there had been security force collusion.
A father-of-three Mr Finucane was gunned down by loyalists in his Belfast home.
Twelve Canadian MPs including the parliamentary leader of the Bloc Quebecois, Conservatives, Liberals and Democrats have put their name to the petition and a letter to British Prime Minister Tony Blair.
An independent international inquiry would "help remove this barrier on the road to peace", they claim.
Retired Canadian judge Peter Cory released his report to the Irish and British governments in October 2003 on the murders of Portadown Catholic Robert Hamill, RUC detectives Harry Breen and Bob Buchanan, Catholic solicitors Pat Finucane and Rosemary Nelson and LVF leader Billy Wright.
Taoiseach Bertie Ahern published the relevant sections of the report and signalled his intention to hold a public inquiry into the murder of Harry Breen and Bob Buchanan.
In an unprecedented move Judge Cory contacted the four families in Northern Ireland in January to inform them he had recommended public inquiries into the deaths of their loved ones.
At Weston Park in July 2001 the British government committed to making public the Cory findings and following recommendations contained in the report.