Mikolaj Wilk, 35, died after he was attacked at his home in Maglin, Ballincollig.
There was another woman as well as two young children aged under six in the house at the time of the incident.
Gardai said the man had died from his injuries.
Officers investigating the incident say they are now searching for the men behind the attack.More news: Jeff Horn Misses Weight Against Crawford At First Attempt
Gardai are appealing for witnesses or anyone with information to contact them at Gurranabraher on 021 4946200, the Garda Confidential Line on 1800 666 111 or any Garda station.
O'Sullivan added that Wilk's partner was also taken to the Cork University Hospital but had only suffered non-life threatening injuries from the home invasion.
The couple's home now remains sealed off in order for a forensic examination to take place.
They say the group fled the scene in a auto, believed to be a BMW Three Series, which was later found burnt out at Inniskenny in Waterfall.More news: Federal authorities arrest 74 people in wire transfer scam
The gang left the scene before gardai arrived in what gardai believe was a BMW 3 series. One report on Twitter is saying there was a firearm found in the vehicle. They are also anxious to interview anyone who spotted anything unusual or suspicious in those areas during the last three days.
Fundraiser has been set up online for Mikolaj Wilk to help Cork murder victim's family.
Mr Wilk, who was originally from Poland, lived in Ballincollig for several years and ran a garden maintenance business.More news: Federal Bureau of Investigation agent who shot club patron while breakdancing charged with assault