Tributes are being paid to the local man in his 20s after news of his death emerged.
Gardaí have since launched a murder investigation.
Friends yesterday gathered at the location where he was found, leaving flowers and tributes to him.
Mr Gibbons is understood to have been on a bus in the early hours of Sunday morning when a disagreement with others arose.
But after he left the bus in Kildare town it is understood a row developed at Magee Terrace and there was an incident in which Mr Gibbons received a head injury.
Magee Terrace is close to the garda station in the town.
Mr Gibbons was then found unresponsive and rushed to Naas General Hospital. His condition worsened and gardaí confirmed that he died on Thursday.
In a statement, gardaí said a post-mortem examination has been carried out, the results of which will not be released for operational reasons.
Following the post-mortem examination, An Garda Síochána has now commenced a murder investigation.
“Gardaí continue to investigate a serious assault that occurred in Kildare town in the early hours of Sunday. The man, aged in his 20s, who was found unresponsive on Magee Terrace at approximately 3:15am, has since passed away in hospital,” they said.
Ryan Gibbons
Today’s News in 90 Seconds, Friday October 31
Locals commenting on social media have said Ryan was a “gentle soul” with a “big friendly smile”, while others described him as a “true gentleman”.
Many commented on his smile and laugh, and one said he was: “one of the nicest lads you would ever meet”.
The Dublin Gaelic Fans Facebook page also paid tribute to him saying: “All of us in the Dublin GAA community are deeply saddened by the heartbreaking loss of Ryan Gibbons, who passed away yesterday, after a serious assault.”
“Ryan was a proud Dub and passionate GAA fan living in Kildare. His passing has left an unimaginable void in the lives of his family, friends, and all who knew him,” they added.
Local councillor Noel Heavey said the attack on Mr Gibbons had horrified people in the area.
“People are very upset about it, he was only a young man,” he said.
Social Democrats Councillor Pat Balfe said: “Thoughts and prayers are with his family and friends at this awful time. May he rest in peace.”
Gardaí are continuing to appeal to anyone with information in relation to the incident. Any road users who were in the area between 2:00am and 4:00am and who may have video footage, including dash-cam, are asked to make this footage available to investigating gardaí.
Anyone with any information is asked to contact Kildare Garda Station on 045 527730, the Garda Confidential Line on 1800 666 111, or any Garda Station.