Gardaí are not treating the death of a man in Dundalk early today as suspicious.
The results of a post mortem examination carried out this afternoon revealed that the 29-year-old man died from natural causes.
Gardaí and emergency services rushed to a house in the Oaklawn Estate shortly before 4am after being alerted that a man had been injured.
He was pronounced dead at the scene a short time later.
A 27-year-old man was arrested and brought to Dundalk garda station for questioning.
He was later released and a file is being sent to the Director of Public Prosecutions.
Gardai are still investigating an assault on the deceased man but say this did not cause his death.
The deceased man had been renting the house. He was not from Dundalk but had been working in the area.
He had spent the night socialising in the Co Louth town with the other man.
It is understood they became involved in an argument on the way back to the house where their dispute escalated.
Gardaí were intially treating the death as suspicious but it became clear there was no foul play once the post mortem examination was completed.
The results revealed that the man had an underlying health condition and died from natural causes.