The first prosecution linked to the murder of mother-of-10 Jean McConville over 40 years ago has found a former senior IRA leader not guilty.
The 1972 killing was one of the most notorious of the Troubles.
On Thursday, Ivor Bell, from Ramoan Gardens in West Belfast, was cleared of requesting the widow's murder.
The court case also heard allegations that former Sinn Faith leader Gerry Adams had recommended her murder and disappearance.
Mr Adams gave evidence and strenuously denied involvement.
- Jean McConville – The Disappeared Mother-of-10
Addressing the jury, the judge said: "There is now no evidence which prosecution can put before you in order to support the case.
"My role now is to direct you to return to verdict of not guilty, because you simply cannot find him to have done the acts alleged."
In a statement issued afterwards, Mrs McConville's son Michael said the family were "bitterly disappointed" the Boston tapes could not be used as evidence and demanded a full public inquiry.
"We may not have got justice, but we have got some truth. But this cannot end here," he said.
Mr Adams has always been denied being in the IRA and in evidence to Belfast Crown Court, said he had no part to play in Mrs McConville's abduction, murder or secret burial.
He said: "I categorically deny any involvement in the abduction, killing and burial of Jean McConville, or indeed any others."
Mrs McConville, who was wrongly accused of being an Army informer, was dragged from her west Belfast home in front of her children in December 1972.
She was shot and secretly buried by the IRA, becoming one of the Disappeared victims of the Troubles.
Her body was recovered from Shelling Hill Beach in County Louth in 2003.
The case against the 82-year-old Mr Bell was based on alleged admissions made to a Boston College oral history project, which were played in public for the first time during the legal action.
The judge ruled the tapes were unreliable and could not be used as evidence against him.
Ivor Bell's defense team argued that he could not be since he was the man on the tapes, known as 'Interviewee Z' and that he had been living in County Louth at the time of the murder.
In a ruling on Wednesday, the judge said there was "overwhelming" evidence it was Mr Bell speaking on the recording.
Gerry Adams, a former west Belfast MP, was called as a defense witness and spent over an hour giving evidence on Monday.
Mr Adams, who now sits in the Irish Parliament, said he believed Mrs McConville should "not have been shot", but should have been shown "compassion".
The so-called Boston tapes collated accounts from former IRA and UVF paramilitaries about their activities during the Troubles on the understanding these would not be made public until after their deaths.
In 2014, the PSNI won a trans-Atlantic court battle and seized some of the tapes.
Ivor Bell was subsequently charged with two counts of soliciting murder. He was deemed unfit to stand trial in 2018 and a legal process known as a 'trial of the facts' was launched to establish the truth of the allegations.
He was found unfit to stand trial and excused from attending the court hearings on health grounds, the trial went ahead as a trial of the facts alone.
On the tapes, Z was asked if there was a possibility that allegations Gerry Adams had given the order for Mrs McConville's killing and disappearance were wrong.
'Policy of disappearing informants'
Interviewee Z replied: "The only thing I have to say is this – Gerry would have just passed the information back to GHQ [IRA’s general headquarters] [that] one, she was a tout, two, she was taking money, three, she had to be executed. Right?
"Whether he knew she had 10 kids or not, I don't know."
- Ivor Bell unfit for trial over Jean McConville murder
Interviewee Z was also asked about a "policy" of disappearing informants.
He claimed it would have finally been a decision for the IRA's general headquarters but that the "Belfast Brigade" would have "advocated" it.
Interviewee Z claimed Mr Adams was the IRA's commanding officer (OC) in Belfast at the time.
'We should shoot touts'
He said: "He was the OC of Belfast. I was operations officer. Pat [McClure] was the IO [intelligence officer]. Pat handled it and directly tied in with Gerry.
"The first I knew about that woman was, I was told she was being shot as a tout and the reason for it was she was an informer.
"They told me about radios, signals and pulling the curtains up and down.
"I said, 'I don't know anything about anything, other than we didn't have jails so we should shoot touts.'
"The people who came to me was Pat and Gerry."
The interviewer also asked about Mr Adams' attitude towards "burying" Mrs McConville.
Interviewee Z said: "Just that she was a tout and she should be shot.
"I wouldn't say he would have liked it very much."
Z further described his own attitude towards informants.
"At the end of the day, she's an informer," he said. "Worse than that, she's an informer for money.
"Whatever is decided, I'll back that up. I said, 'I don't have a problem with shooting touts.'
"But they said, 'We are going to bury her.'
"I said I didn't agree with that … If that's done, it's done without my agreement. It defeats the entire purpose."
He later added: "I said: 'If she's a tout, the fact that she's a woman shouldn't save her.'
"I wasn't told she had 10 kids and no husband.
"I can't say for sure that I would have said, 'No, I don't shoot her.'
"But I may have had second thoughts."
St peter's priest
Meanwhile, it was also believed Mr Adams had asked a priest to get Jean McConville out of Belfast.
According to Interviewee Z: "Gerry said they asked a priest to get her out of town and the priest to St Peter's refused."
When asked about his motivation for taking part in the oral history project, Z provided two reasons – historical accuracy and annoyance at discovering he was being blamed for the controversial killing.
The court heard claims high-profile Republican Bobby Storey, referred to as a "clown" called at Z's house to make inquiries because Sinn Fein were coming under political pressure over the Disappeared.
Z said: "What annoyed me, he is an idiot to my house to ask about the woman in the flats.
"I told him … my knowledge of that would be second-hand, why don't you ask Gerry?
"The annoying thing is, he actually believed Gerry."
Most of the Boston College interviews with Republicans were carried out by former IRA prisoner Anthony McIntyre, an outspoken critic of Sinn Féin.
The judge ruled Dr McIntyre had asked leading questions, which compromised the integrity of the tapes as evidence in the court proceedings.
The judge also ruled the false promise that testimony would remain confidential until the contributor's death could have released Mr Bell to speak the truth, but could also have given him the freedom to lie, distort, blame or mislead.
There was clear bias that both Mr McIntyre and Mr Bell had an agenda and were "out to get" Mr Adams and others, the judge said.
Earlier in the case, Professor Kevin O'Neill, the director of Irish Studies at Boston College, said the project was now held up as a model of how not to conduct oral history.
No one has ever been convicted in connection with the murder of Mrs McConville.
In 2014, Gerry Adams was arrested and questioned for four days but was released without charge.
Reporting restrictions on the legal action were lifted on Thursday.