A priest is today calling on people with information on the murder of a Louth taxi driver to co-operate with investigators.
Martin Mulligan, 53, was found dead yesterday morning near his car outside Dundalk.
He suffered a number of stab wounds in the incident close to the border, and PSNI officers are helping gardaí in their effort to trace who was behind the killing.
Local rector in Dundalk, Fr Michael Cusack, believes people out there could help the inquiry.
"Somebody knows who did this," he said.
"Certainly whoever it is, whoever perpetrated the act knows it themselves - but certainly there must be a wider family and connections around who will notice something very different about the person's behaviour.
"And they should really be cooperating with all of the forces to try and bring some semblance of justice."
Gardaí say they've yet to establish a motive for Mr Mulligan's killing - while officers are also liasing with the PSNI as part of the investigation.
Following forensic examinations last night the inquiry was upgraded to a murder investigation.