A new person of interest has been identified in the investigation into the murder of Ashling Murphy.
It comes as thousands of people turned out for vigils around the country.
Gardaí say they continue to investigate the 23-year-old's murder along the canal bank in Tullamore on Wednesday.
They say "significant progress" has been made in the investigation to date, and thank the public for their help.
A dedicated phone line has been set up at Tullamore Garda station as part of the investigation.
Anyone with information is asked to call 057-935-7060.
An Garda Síochána continue to appeal to any person who has not made contact with the investigation team, and who has any information, to come forward.
And they continue to appeal for any information on a Falcon Storm mountain bike with straight handlebars and distinctive yellow/green front forks.
Gardaí believe her killer may have been riding a mountain bike at the time of the assault.
On Thursday, Garda Commissioner Drew Harris said the bike may have been moving around Tullamore in recent days.
"It may have been moving about the town here over the last number of days.
"And really what we're interested in: has anybody seen that bicycle over the last number of days?
"Did you own that bicycle and it's been lost or stolen? Or have you sold that bicycle?"
While anyone who was in and between the Tullamore town centre area and the wider approach roads to The Grand Canal Way in the vicinity of Capincur on January 12th with any form of video footage is also asked to contact Gardaí.
Anyone with information can also call Tullamore Garda station on 057-935-7060, the Garda Confidential Line at 1800-666-111 or any Garda station.
Reporting by: Kacey O'Riordan