Tests are to be carried out to help determine how Gerry Ryan died.
A post-mortem examination was completed yesterday but details of the preliminary results are not being disclosed.
The body was released to Mr Ryan's family yesterday evening and taken to their home in Clontarf, Dublin, as they prepared for a final, heartbreaking farewell.
His funeral will be held tomorrow morning after a private wake in the house this afternoon.
The results of the toxicology tests are not expected to be known for several weeks and they will be included in the pathologist's report.
The report will then form part of a garda file, which is being prepared by officers for a coroner's inquest.
The file will outline the garda inquiries into the circumstances surrounding Mr Ryan's death last Friday. It will also include statements from investigating gardai and from those who were first at the scene when his body was discovered by his bed in his apartment in Upper Leeson Street.
The coroner will decide on the date for the inquest and summon the witnesses mentioned in the garda file.
The inquest is likely to be held within a year.
Initial indications from the scene suggested that the 53-year-old broadcasting legend suffered a massive heart attack.
Toxicology tests are often carried out by pathologists when a relatively young person has died suddenly. The tests can help determine, along with a person's medical records, what factors led to the death.
Garda inquiries at the scene indicated that there were no suspicious circumstances evident. There was no sign of a struggle or forcible entry to the apartment and Mr Ryan had no marks on his body.
Meanwhile, his devastated family spent time alone with him last night in the house where he and his estranged wife, Morah, raised their five children and spent many happy years.
The couple separated in 2008 after 26 years of marriage.
A steady stream of visitors flocked to the period house in recent days to offer words of consolation to Morah and her children, Charlotte, Rex, Bonnie, Elliot and Babette.
But yesterday they were given space to gather together around their husband and father and spend their last moments with him alone.
The house will remain private until 3pm today when the broadcaster will be given a traditional wake ahead of his funeral at St John the Baptist Church on Clontarf Road.
Floral bouquets left by fans were tied to the railings outside the family home.
Passers-by paused to spend a quiet moment reading the tributes, their heads lowered and some wiping away tears.
The bustling street where the family live came to a standstill as the hearse carrying the broadcaster pulled up at their home.
Among the moving messages was one from three local children, who also included a drawing.
It read: "My mommy will really miss you. You made her laugh and cry and dance around the kitchen like a mad thing. We danced in the kitchen, too."
Another fan wrote: "You have helped me though a lot of things in my life by just listening to you on the radio. You will be very deeply missed, my friend. Sleep well."
Visitors to the house yesterday included RTE's Ryan Tubridy and Mr Ryan's former colleague at 2FM, Mark Cagney.
Family spokeswoman Joanne Byrne said his loved ones wanted to make the funeral an occasion that would reflect who and what Mr Ryan was, adding that they had drawn solace from the huge outpouring of grief from his fans around the country.
"They are very conscious that, although their grief is so private and they have lost their dad, they are sharing their loss with so many other people, which actually does give them comfort," she explained.
She added that while they were still in a state of shock and disbelief following Mr Ryan's sudden death, they were aware of the queues of people signing books of condolence.
She revealed that Mr Ryan's loved ones were now concentrating on giving him the send-off he deserved.
"We are trying to acknowledge what he meant to everybody, but first and foremost he was a dad," said Ms Byrne.
"We are trying to keep it as close as we can to family and friends, but we understand it won't be completely private."
The family has asked that friends and fans make a donation to their charity of choice rather than send flowers.
Hundreds of mourners, including his RTE colleagues and members of U2, are expected to gather for the funeral Mass, which will be broadcast live on his station, 2FM.
The church will have limited space, holding only around 500 people, so a webcam will stream footage of it online.
John McMahon, head of 2FM, said that he felt Mr Ryan's 300,000 loyal listeners would want to be part of the funeral Mass.
"From our point of view, radio was Gerry's life and we want to pay tribute to that so we will be broadcasting the sounds of the Mass through 2FM," he added.
Source irish Independent