The meeting between Dorothea Carroll and Marion County district attorney Walt Beglau is expected to take place tomorrow.
The death of Andrew ‘AJ’ Hanlon, 20, from Dundrum in Dublin, has sparked a public outcry in Ireland.
A week after he was shot dead by police in Silverton, Oregon, his family have still not been given the full facts surrounding his death.
Authorities say their investigation into the incident is expected to last another two weeks.
Mr Hanlon who, according to his sister, had suffered mental health problems in recent months, was killed when police officer Tony Gonzalez responded to a report of a burglary.
His sister, Melanie Heise, and her husband Nathan who live in Oregon, said he was in the habit of banging on their door when he wanted to be let in, and that he may have become confused and knocked on the wrong door.
Officer Gonzalez is on paid administrative leave.
Few details of the shooting have emerged, including the circumstances of Mr Hanlon and Officer Gonzalez’s encounter.
The Heises said the police knew Mr Hanlon and knew of his recent problems.
The 20-year-old moved to Silverton a year ago at the urging of his sister and her husband.
Doug Hansen, a deputy district attorney, said his office expects to convene a grand jury on the death once an investigation is completed.
Mr Hanlon’s mother faces a €10,000 bill to bring her son home.