Updated 09.55
Gardaí say they're following a definite line of inquiry following the fatal stabbing of a grandfather in Dublin.
Michael Gannon (55) was babysitting his two grandchildren at their home in Skerries - when he was attacked yesterday.
A man (29) who was arrested nearby shortly after the incident is still being questioned by gardaí.
A post mortem examination is to be carried out today to determine the exact cause of Michael Gannon's death.
Mr. Gannon, from Finglas in North Dublin - was minding his two grandchildren at his daughter's home in Mourne Park in Skerries in North County Dublin - when he was attacked and stabbed to death.
The incident happened at around 6 O'clock yesterday evening.
It is understood that while the children were in the house they did not witness the attack.
Shortly afterwards a man (29) - who had locked himself in a nearby house for a time - was arrested under Section 4 of the Criminal Justice Act.
He was taken to Ballymun Garda Station - where he is still being questioned.
A knife has also been recovered and is due to undergo forensic tests.
It is understood gardaí are not looking for anyone else in connection with the incident.
The Skerries house where Michael Gannon was killed pictured above via @FrankGreaney Twitter
Mourne Park in Skerries, Co. Dublin:
