A major investigation is underway after a man was discovered in a Dublin apartment with a fatal knife wound on Tuesday.
Gardai are now trying to determine if the man, who has been named locally as 36-year-old David Ennis, had been dead for a number of days.
Officers were called to the apartment at Claddagh Court in Ballyfermot at around 2.30am after reports of an incident.
Emergency services rushed to the scene, but Mr Ennis was pronounced dead a short time later.
A woman in her 40s believed to have been known to the deceased was arrested and taken to Clondalkin garda station.
She remained in custody overnight under Section 4 of the Criminal Justice Act and can be questioned for up to 24 hours.
It is understood that the suspect told emergency services that Mr Ennis "fell" on a knife and claimed his death was an accident, reports the Irish Independent.
Gardai are now probing if Mr Ennis died sometime, possibly days before he was discovered.
His body was removed from the scene on Tuesday morning for postmortem.
When gardai arrived at the scene, two other people were present alongside the victim and the suspect.
All parties have been interviewed by gardai, and officers say they are not looking for anyone else in relation to the incident.
Gardaí have been conducting inquiries locally and will be reviewing CCTV footage to determine who came and went from the building in recent days.
Residents of the complex have said that the area has been unsafe for some time.
Speaking at the scene, Claddagh Court resident Joan Murphy told the Irish Mirror: "It's not easy living in there. You bolt your door at night, and you're making sure you don't reopen it."
The 72-year-old, who's lived in the complex since it opened, added: "If you knocked at my door at night, there's no way you're getting an answer.
"There's always fighting going on. And if you heard that racket in sitting room, you'd be wondering 'who is going to be killed'.
"Residents have said for years it will take somebody to be killed, and it's just happened. We've predicted this for years.
"It's been like for this years. There's no security. It's just not safe. Residents feel unsafe. I've had to put a camera on my door - at least I know who's outside my door. There's no way if you rang my bell after dark that, I'd answer the door.
"I wouldn't open that door to anyone. "
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