Gardaí have to wait a number of days before they can attempt to talk to a man in connection with the murder of Ashling Murphy.
The man, who is currently in hospital, is being treated by officers as a “person of interest” in relation to Wednesday’s attack along the Grand Canal in Tullamore.
The Irish Examiner understands garda interest in this man is linked to a distinctive bicycle that gardaí suspect may have been used at some stage on Wednesday by Ms Murphy’s assailant.
Sources explain there is a “lot of work to do” before the man can be considered a suspect, pointing out that gardaí must have a reasonable suspicion before they can make an arrest.
The investigation is “moving at pace”, gardaí say, following the sudden release late on Thursday night of an initial suspect after various inquiries found that he could not have been involved in the murder.
Gardaí are confident they have good eyewitness descriptions of the killer and have significant forensic material from him at the murder scene.
After making their appeals, information was provided to gardaí that another woman had seen a man acting suspiciously in the area hours before the murder - information described as important to the team.
A statement from Garda HQ said they had made “significant progress” in their investigation.