The widow of murdered Belfast solicitor Pat Finucane is to have talks with Prime Minister David Cameron about the family's demand for a full independent inquiry.
Even though Downing Street is believed to be considering agreeing to some form of investigative tribunal, Geraldine Finucane said they will settle for nothing less than a probe which is public, effective and independent.
She said: "We would not accept such an inquiry and neither will the wider public who have very serious concerns about the circumstances of Pat's murder."
Relatives of the dead man, aged 39 when he was murdered, meet the Prime Minister and Northern Ireland Secretary Owen Paterson on October 11 at Downing Street.
Mr Finucane's widow added: "It is expected that we will be told what the decision of the Government is with regard to the holding of an inquiry.
"I expect the Prime Minister to confirm that his Government will honour the commitment given during negotiations at Weston Park in 2001 and establish an inquiry that is consistent with the recommendations made in the report submitted to the Government by former Supreme Court Judge Peter Cory in 2004."
Loyalist paramilitaries shot Mr Finucane 14 times at his Belfast home and there were later claims British security forces colluded with the lawyer's killers.
Tony Blair promised the victim's family that the allegations would be investigated but no inquiry was set up.
Mr Finucane was shot as he sat eating a Sunday meal at home, wounding his wife in the process. The couple's three children witnessed the 1989 attack.