Former Sinn Féin councillor Jonathan Dowdall has accused Gerard Hutch of "terrorising" his family and sending people to his relative's home to get people to come to court.
Dowdall said he was not prepared to discuss a gun attack on his uncle's house for Gerard Hutch’s benefit because he did not do it.
He said he had already spoken to the gardaí about it and Sinn Féin had interviewed him about it, the party was "fully aware of the background" to it and "it wasn’t me".
Dowdall was giving evidence in the trial of Mr Hutch for the murder of the Kinahan gang member David Byrne, who was shot dead at the Regency Hotel in February 2016.
Mr Hutch, 59, from the Paddocks in Clontarf in Dublin, has pleaded not guilty to the charge.
Dowdall was giving evidence for the fifth consecutive day in the Special Criminal Court and was being crossed examined for the fourth day.
The court was told that Dowdall’s "uncle Jimmy’s" house was "shot up" and that while his uncle told the gardaí that "the only person he had trouble with" was his nephew Jonathan he said he was "happy" it was not him.
"There’s a back story," Jonathan Dowdall said to Mr Hutch’s defence counsel Brendan Grehan. "I’m not discussing it in this court. I didn’t do it. If the guards want to speak to me about it I will."
"I’m not going into it for your client's benefit. I had no enemies before this but every person's name mentioned in this court is another enemy."
"All this stuff ends up in the media and it hurts my family," he said.
Dowdall pointed at Gerard Hutch who was sitting in the dock and said: "There’s more names to keep him happy over there. He’s terrorising my family. When I ring my wife, there’s a barrage of threats and more threats.
"He's already sent people to me uncle's house to get them to come into court," he said.
He said when he admitted on the secret garda recordings of his conversation with Gerard Hutch as they travelled to and from Northern Ireland on 7 March 2016 that he was involved in the shooting and that "Jimmy doesn’t know 100% that was me".
"Jimmy ripped off a load of people, now he probably knows Gerard, but he tried to get me admit it. I had to f****** lie," he said to Gerard Hutch in the car.
Dowdall described this as "bravado talk" and said "there’s a back story to that which I won’t discuss.
"It was bravado talk with a load of other stuff. I didn’t do anything to do with me uncle's."
He said a lot of people knew about it and referred to Stephen McCormack from the "contos" Continuity IRA who had served two years in prison asking him about it. He said on the recordings that he was "ringing me, arrived at me gaff three times, I don’t know him".
The court also heard today that Dowdall also referred to Brian Keane of Sinn Féin asking him about the attack on his uncle Jimmy’s home before Dowdall was chosen by the party to represent it, while the dissident republican was present.
Mr Grehan read extracts from the conversation where Dowdall said that "Brian Keane was interviewing me and he’s sitting there watching it".
He described McCormack as director of elections for Dublin.
Dowdall also admitted today it "came as a shock" to him when the gardaí revealed they had secretly recorded his conversation with Gerard Hutch when they drove to Northern Ireland on 7 March 2016.
He had been arrested on suspicion of the murder of David Byrne and was being questioned by the gardaí.
He agreed that he had been telling them lies and in some interviews "joking with them" and "messing with their heads".
When the gardaí asked him why his phone was "pinged" at the Regency Hotel and on a journey to and from Lifford in Co Donegal he said it was probably "on a bus".
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Intimidation 'at a whole different level'
Earlier, Jonathan Dowdall told the Special Criminal Court that since he decided to give evidence against Gerard Hutch, the level of intimidation has increased and that the threat to his family is now "at a whole different level".
The former councillor said that his mother is in exile, his children had to leave school and his daughter left her job as a solicitor's apprentice.
He said that "nobody interfered with my wife and kids" when he was charged with murder, but "as soon as I decided to come out and give evidence, the level of intimidation on my family" increased.
He said his 62-year-old mother received threatening phone calls, some from people she was kind to when they "were kids", telling her "she's dead".
He said she is now in exile in another country.
He told the three judges today that "children under 10 are under threat", out of school since September and, he said, the school "won't take them back".
"No decent man threatens a 10-year-old kid or a 14-year-old kid or gets someone to ring my mother," he said.
He said death threats had been issued on Twitter and his daughter's internship with a solicitor was terminated.
"She had to leave the job," he said.
"Company said it's too dangerous to have her coming in and out of work.
"Everything I feared happen, did happen and worse.
"The level of pressure, nobody ever went against them," he said.
"This is why nobody comes in and gives evidence."
He also criticised Mr Hutch's defence counsel for continuing to ask him questions and insisted he was an honest man.
"I'm here five days," he said.
"This is the fifth day, I gave in statements, you covered none of them, all that's happening is you're attacking me and attacking me. I explained why I couldn't answer the questions in the station."
Mr Grehan explained to Dowdall that this was his job and he was going to continue to do it.
The court has been playing extracts from Dowdall's interviews with gardaí on 18 May 2016 and asking him questions about the answers he gave to them.
Mr Grehan is pointing out discrepancies in what he said to the interviewing detectives then and what he says now and says Dowdall is lying.
Dowdall repeated that he could not tell the truth to gardaí at the time.
He admitted that he lied to gardaí in 2016 when he told them he did not drive his father anywhere on 4 February. Gardaí told him cell site analysis showed his phone "pinged" and he was there.
"I was arrested Mr Grehan, I couldn't say anything," he said.
He agreed that the room at the Regency Hotel used by one of the gunmen was booked on his wife's phone, booked in his father's name, his father paid cash, collected the key card and passed it on to someone else who stayed in the room.
Dowdall said today that Patsy Hutch told him the room was not used for anything and told him not to say anything to gardaí about it.
"Look at the position I'm in now," he said today. "I couldn't tell them."
He said Patsy Hutch told him the room and van were not involved in anything and not to say anything, but he got "the go-ahead" on 7 March in his recorded conversation with Gerard Hutch to talk about the van.
He agreed that he lied to gardaí during the interviews.
"I didn't tell them the truth about the room, I explained all this and the reasons why," he said today.
"I didn't know what the room was for, I'm being made aware it was used for a murder, I couldn't say anything."
Gerard Hutch has pleaded not guilty to the murder of David Byrne at the Regency Hotel on 5 February 2016.
