Gardai believe an 8-year-old child suspected of being murdered, had not been seen for up to two years.
An appeal for missing Kyran Durnin was made on August 30, but following new information, the case was upgraded to murder on Wednesday.
The investigation into the whereabouts of the child’s mother, 24-year-old Dayla Durnin from Hand Street in Drogheda Co. Louth has been stood down after she was located in the UK on Friday.
In August gardaí appealed for information about mother and son after their family had become concerned for their welfare.
It is now understood that the last confirmed sighting of the missing boy may have been up to two years ago.
Ms Durnin has three children, and she had moved between Drogheda and Dundalk Co. Louth for a period of time, before moving in with her mother in Hand Street.
The boy’s father had been making a number of efforts to contact him.
Gardai had been going through extensive CCTV footage and carrying out door to door inquiries over the past number of months in an effort to locate the mother and son.
They issued a statement on Wednesday saying: “Despite extensive inquiries carried out by gardaí to date, An Garda Siochána have been unable to either locate Kyran, identify any information on his current whereabouts or any evidence that he is currently alive.
“Following inquiries to date, investigating Gardai now believe that Kyran is missing presumed dead.
“A murder investigation has been commenced.”
In September the child’s grandmother Rhonda Byrne Tyson, issued an appeal for her daughter to contact her.
She told Drogheda Life that she wanted her daughter Dayla, and Kyran to come home.
Rhona Byrne Tyson said her daughter was diagnosed with type one diabetes and spent most of the summer in hospital and has to inject herself five times a day explained her mother.
“I’m worried sick,” Ms Byrne Tyson said at the time. “I know that she got a supply of medication recently, but I’m really terrified about what will happen when that runs out.”
She said she had been calling her daughter several times a day since she disappeared, but her calls went straight to voicemail.
An incident room has been established at Drogheda Garda Station.
Tusla, the Child and Family Agency, is working closely with and fully cooperating with the Garda investigation.