The 31-year-old man at the centre of investigations into hospice deaths in Dublin in the late nineties has been released without charge pending further enquiries.
The former employee of Our Lady's Hospice in Harold's Cross, Dublin, claimed to have helped in up to 10 assisted suicides at the facility in 1997 and 1998.
He was arrested in Belfast after he contacted the PSNI and volunteered information on his role in the alleged assisted suicides.
A Garda spokeswoman confirmed today that two members of the Gardaí interviewed the man yesterday in Belfast in an attempt to assess his credibility.
A PSNI spokeswoman said the man was released this morning.
Meanwhile, the chief executive of the hospice, Mo Flynn, has said that the families of people who died would now be contacted.
Ms Flynn said although "no queries regarding their deaths had ever been raised by their families or the medical or nursing staff," families involved would be contacted by the hospice.
Ms Flynn also said anyone with concerns could contact the hospice directly.