HE SAID he slept on a couch in a shed at Cregg House the following Thursday night, May 5th. He said he heard the devil's voice "telling me I was his son".
He said he believed the devil "because of the powers I have".
"I'm possessed by the devil," he said. "I said a prayer to him when I was a child. The devil said `You're my son, Brendan'.
He said the powers he had were that he could "kill the devil's daughter and the priest who was trying to christen his baby son."
He said he had powers to burn and make up fires.
Mr O'Donnell said he stayed a few nights at Cregg House. No one came to visit him and he just had conversations with the devil, he said. He went into the wood and lay down on a mattress.
He said he also drove Father Walsh's car to Williamstown Pier on either the Thursday or Friday night about 1 a.m. or 2 a.m.
Mr O'Donnell said he was going to commit suicide but the car got stuck on the rocks. "I was going to roll the car into the water and drown."
It was not true to suggest he got that idea from John Gallagher, an inmate of the Central Mental Hospital, Dundrum, who was found guilty but insane of the murder of his girlfriend and her mother, Mr O'Donnell said. He said Gallagher had never told him about driving off a pier in Co Donegal.
He said he burned the car at the pier because he liked fire and got enjoyment out of it.
He said he was at the back of Fiona Sampson's house. He saw a helicopter and thought it was "after me for killing Father Joe".
He said he knew Fiona Sampson having gone to school with her. He said he heard the devil's voice say to him "Kidnap Fiona Sampson and kill her".
He broke into the house through the back door and forced Fiona to get into the family car.
"I was going to kill her because the devil told me to. I got to like her and I didn't bother killing her," he said.
Fiona was wearing a night dress. They drove away. He said he wanted to go to Woodford. The car went off the road and they had gone across fields and bogs. He wanted to get another car and had hijacked a car on the road to get to Woodford.
Then the gardai had come up and arrested him. He said he had discharged a shot in the car "because I liked firing the gun".
Mr O'Donnell will continue his evidence to the court today.