US Special Envoy for Northern Ireland Mitchell Reiss is to meet the family of a Dublin man who was murdered in April last year.
Mitchell Reiss is to meet with the Rafferty family
Joseph Rafferty's family blamed the killing on republicans and claimed that Sinn Fein representatives in Dublin did not do enough to prevent the murder.
Members of the Rafferty family are due to travel to the United States next weekend to meet senior US politicians.
Mr Reiss said the case raised "a number of serious concerns".
"I think it raises all the issues that are of broader concern to the community across Ireland, which has to do with criminality and paramilitary violence on both sides of the sectarian divide," Mr Reiss told BBC Radio Ulster.
"This terrible tragedy afflicted the Rafferty family and I am interested in meeting with them when I am in Dublin."
Mr Reiss was due to meet the SDLP on Saturday.