1,200 leads in Quinn murder probe

Mr Quinn, 21, from Cullyhanna, died after being attacked and beaten at a shed near Castleblaney in October.

IRA members have been blamed but Sinn Fein denies any republican involvement.

Superintendent Karl Heller said they were resolved to bring the perpetrators to justice but needed their family and friends to examine their consciences.

He said there had been close liaison with colleagues in the Police Service of Northern Ireland, with many inquiries taking place north of the border.

More than 400 witness statements have been taken, he said.

"We have carried out many inquiries and indeed we are following in excess of 1,200 particular lines of inquiry," he said.

"Well resourced"

"The people who were involved in this crime will have loved ones, whether they be sons, brothers, they have family members. They may have noticed some change in their loved ones behaviour.

"They do possess vital information and it's information which will help us solve a crime which was not only a crime against a young man, it's a crime against the community."

Mr Heller said it was a "well resourced, professional and very thorough investigation".