The 62-year-old brother of shooting victim Walter Tomkins remained in custody today at Baltinglass Garda Station.
Cecil Tomkins was arrested following the fatal shooting of his 66-year-old brother Walter in the bungalow they shared near Shillelagh, Co Wicklow.
Gardai were called to the home of the two farmer brothers after neighbours heard a gunshot at their home on Thursday evening. A shotgun was taken away from the house by gardai.
The violent death of the popular farmer shocked the village of Shillelagh and surrounding countryside as local people tried to come to terms with the tragic event.
Several people living and working in the area paid tribute to the local man who had been a central part of community life for decades.
The funeral of their mother Isabella took place on Monday last. Mrs Tomkins, who was aged 91, had lived with her sons.
Gardai said they were following a definite line of inquiry and were not looking for anyone else in connection with the fatal shooting.
Sarah Rooney, a waitress in a local restaurant, said Walter Tomkins was a very popular member of the community who was very helpful.
Speaking at the Park View House restaurant, she said: "Walter was a lovely man. He had a great sense of humour and it was always great to see him coming into the restaurant.
"He often had a joke and took great delight to telling them. We can't believe what has happened," she said.
It was indicated that Mr Tomkins bought hot meals at the restaurant to bring home for himself and his brother Cecil and their elderly mother.
A post mortem examination was carried out on the remains of Mr Tomkins at Naas General Hospital.