Gardai are hunting the killers of a Polish man who was attacked by gang in his own home.
The men, who were carrying weapons, entered the house and seriously assaulted the man and his partner, whose injuries are not life-threatening.
Another woman, aged in her 30s, and two children under the age of six, were also in the house at the time of the attack but were unharmed.
Mr Wilk died later in hospital, while his partner remains in hospital and is undergoing treatment for her injuries.
Gardaí are appealing for witnesses or for anyone with information to contact them at Gurranabraher on 021 494 6200, the Garda Confidential Line on 1800 666 111 or any Garda station.
Police said Wilk died in the hospital, despite the efforts of all medical teams involved.
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A auto was found burnt out several kilometres away in Waterfall.
A post-mortem examination is scheduled to take place later on Sunday.
The gang left the scene before gardai arrived in what gardai believe was a BMW 3 series.
The Gardai noted that they are anxious to interview any drivers who may have been travelling through the Ballincollig, Maglin, Waterfall and the Ballinora areas between 2 AM. and 5 AM. on Sunday morning, who may have dashcam footage of the vehicle.
Fundraiser has been set up online for Mikolaj Wilk to help Cork murder victim's family.
RTÉ reports that Mr Wilk, who was originally from Poland, had lived in Ballincollig for several years and ran a garden maintenance business.