The PSNI are continuing to question a man following the death of Thomas O'Hare, who was doused with petrol and set alight along with his partner on Monday.
According to the PSNI the man was arrested on "suspicion of murder and attempted murder".
Mr O'Hare (33) died in Belfast's Royal Victoria Hospital in the yesterday from injuries sustained in the attack at his home outside Keady in south Armagh.
Police believe up to six people were involved in the attack.
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The dead man's partner, Lisa McClatchey (21), remains critically ill in hospital with serious burns.
Gardai are waiting to question four brothers who presented at a hospital in Co Louth shortly after the attack. They are being treated for serious burns in St James's Hospital.