The mother of a man murdered in Co Monaghan in 2007 has called on the Sinn Féin leader to request an apology from a member of the party over comments made about the case.
21-year-old Paul Quinn was ambushed, beaten and killed by a gang of men near Oram.
The Independent Monitoring Commission said it believed the IRA was involved in the murder and it was the result of a local dispute.
After the killing, Sinn Féin's Connor Murphy said he had spoken to the IRA and was satisfied it wasn't involved.
Paul's mother Breege wants Mary Lou McDonald to get answers in relation to the republican claims.
Speaking on Newstalk's The Hard Shoulder, she said: "I also want her to ask him to give us the names of the IRA that he said he talked to in Cullyhanna a couple of days after Paul was murdered
"He said he spoke to the IRA in Cullyhanna and they gave him great assurances that they did not murder Paul."
However, in an interview with RTÉ's Bryan Dobson this evening, Ms McDonald said "the best thing is for Conor to speak to Breege and to speak to the family".
She said that she would speak to Mr Murphy about the issue as she said she understood "this mother has lost her son in the most traumatic of circumstances".
She added that she was in no way suggesting that Mr Quinn was a criminal and that "the only criminals in this scenario are the people who took Paul Quinn's life".