Julian Cuddihy, 42, of Churchtown, Carndonagh was remanded in custody to appear at a special sitting of Letterkenny District Court next Wednesday.
Detective Garda Bernard Mullins told the court that he arrested Cuddihy and charged him with two counts of murder, at Buncrana Garda Station last night.
To the first count Cuddihy replied “I have no response” and to the second count he added: “I’m not signing that.”
Solicitor Ray Lannon of Michael D White Solicitors in Carndonagh asked Judge Kevin Kilrane that his client receive immediate psychiatric assessment at Castlerea Prison.
Judge Kilrane asked Mr Lannon if his client had a history of mental illness.
The judge was told that a local doctor had attended Cuddihy on October 15 but he was not psychiatrically assessed. “He was previously assessed and there was no diagnosis of psychiatric illness found,” he said.
Judge Kilrane recommended that the accused be assessed as soon as was conveniently possible.
Free legal aid was also granted.
Cuddihy, wearing blue tracksuit bottoms, a wine- coloured sweat top and black trainers, sat wringing his hands throughout the hearing.
He was accompanied into court by three Donegal-based detectives who sat beside him throughout the hearing.
The couple were found by family members at their home at Churchtown, on the outskirts of Carndonagh just after 9am on Thursday.
The couple were very well known in the area.
Mrs Cuddihy, 73, was a former nurse who was originally from Malin Head.
She was known throughout Donegal for her voluntary work, especially with Letterkenny General Hospital.
Her husband Jimmy, 77, was originally from Kilkenny but had moved to Donegal to work many decades ago.
He was a former maths teacher at Carndonagh Community School and still gave maths grinds to pupils in the area.
A psychologist has been drafted in to support staff and pupils at St Patrick’s Girls’ School in Carndonagh, Co Donegal, following the brutal killings.
Jimmy and Kathleen Cuddihy’s daughter, Delilah, a teacher, arrived for work shortly before 9am on Thursday. Minutes later, news of the deaths reached her.
A psychologist from the National Educational Psychological Service later arrived at the school.