This marks the first arrest in the investigation, which was reclassified from a missing persons case to a murder inquiry four years ago.
A man in his 50s has been taken into custody in relation to the 29-year-old case of Jo Jo Dullard’s disappearance and presumed murder.
He was arrested early this morning in Kildare on suspicion of murder and is currently being held at a local garda station.
This marks the first arrest in the investigation, which was reclassified from a missing persons case to a murder inquiry four years ago.
Searches are being carried out at two properties and land on the Kildare/Wicklow border as part of the investigation.
On Friday, Jo Jo's sister, Kathleen Bergin, made an emotional appeal on Kildare Today for information.
You can listen to that interview here.
Kathleen reminded people of the route Jo Jo took from Dublin city, missing her bus to Kilkenny, taking a bus to Naas, and hitching a lift to Moone, where she made a phone call to her friend, the last known interaction with JoJo.

Local Parents Could Be Hit Hard As Creches Threaten To Close Over Funding Crisis
Athy Locals Praised After Elderly Dog Saved Following Dramatic Canal Lock Ordeal
€4.4m Cannabis Seizure Sparks Arrests Across Kildare And Dublin
Survivors’ Stories And Counselling Gave Kildare Woman Maeve Leahy Strength To Speak Out About Abuse
€34.5m Boost Backs Quest To Study Memory Loss And Build 3-D Biodegradable Spinal Supports
Newbridge Library To Relocate Next Month Ahead Of 2026 Rebuild
13 New Gardaí For Kildare - But No Increase For Part-Time Maynooth Station
Kildare’s Rain Warning Brought Forward To 9am As Remnants Of Storm Claudia Approach Ireland