The Prisoner Ombudsman is investigating the death of a north Belfast man days after he was released from prison.
Father-of-one Kieran McGrandles (30) and another man died at a property in the Elgin Street area of south Belfast, off the Ormeau Road, on Friday May 5.
It is believed Mr McGrandles died of a suspected overdose.
Earlier this month his family called on BBC NI to remove a jailhouse interview carried out with presenter Stephen Nolan from its iPlayer service.
Read More: Stephen Nolan: BBC face calls to remove jailhouse interview with suspected overdose victim
During the interview Mr McGrandles revealed he had been sexually abused as a boy.
The interview was broadcast as part of a six-part series made by Mr Nolan's production company, Third Street Studios, and fronted by the broadcaster.
While relatives of Mr McGrandles were not contacted by the BBC, a Prison Service official spoke to his mother Geraldine one working day before the interview was broadcast.
During the interview Mr McGrandles appeared agitated and threatened to shoot a police officer, doctor and sex offender dead.
He also revealed he had taken medication not prescribed to him on the morning of the interview.
"I took medication this morning, it's not prescribed to me," he said.
"I went and bought it.
He also said during the interview "I am mentally ill".
Earlier this year, Mr McGrandles was jailed for five months after assaulting a nurse who was treating him.
Prisoner Ombudsman, Dr Lesley Carroll, said an investigation has now been launched after her office was notified about his death.
Mr McGrandles' uncle Seamus McAloran said his family hope events leading up to his death are considered by the ombudsman.
"We believe it is essential that events leading up to Kieran's death are considered, including his dealings with the documentary makers and the clear issues arising from that," he said.
"Kieran clearly said he had taken drugs that were not prescribed to him and that he had mental health issues.
"The Prison Service had a duty of care to him in regard to all that."
Mr McAloran added that his family will ask for a meeting with Dr Carroll.
Dr Carroll said: "The Prisoner Ombudsman’s Office has received notification of the post-release death of Mr McGrandles and has opened an investigation within the scope of the Ombudsman’s Terms of Reference for the investigation of Deaths in Custody.
"Under these Terms of Reference, the Prisoner Ombudsman also investigates post-release deaths, normally up to 14 days after release, and examines whether there are concerns relating to an individual's death arising from their care by the Prison Service."
The Prison Service was contacted.
