McQueary, the former graduate student, is considered to be a key witness in the Sandusky case.
In Ebbers' case, the government's key witness is Scott Sullivan , WorldCom's former chief financial officer.
Mr Robinson was acquitted after a key witness provided evidence "not contained in their original statement".
Police said every teenager at the party in Marlowe Way was a potential key witness.
Landis also was a key witness in a USADA investigation last year that exposed Armstrong's doping.
The government's key witness in refuting their claims was Douglas Faneuil , a brokerage assistant to Bacanovic.
It is understood that a key witness, assumed to be Mrs Robinson, was considered too ill to interview.
But it also tried hard to discredit Mr Mehlis, most dramatically by televising a key witness's supposed recantation.
Now another key witness could end up doing Jones more harm than good.
It follows an Al Jazeera broadcast which claimed that a key witness in the trial was paid for his testimony.
The key witness, Simeon Taylor, said at the trial he had witnessed what happened, but has since retracted his evidence.
The officers' prejudice led them to leave Duwayne Brooks, Stephen's friend and the key witness to the crime, "side-lined and ignored".
The Kenyan government failed to help and prosecutors also had to drop a key witness who recanted some evidence and acknowledged taking bribes, Bensouda said.
Hale, who was sentenced Monday to 28 months in prison for mail fraud and conspiracy following a plea agreement, is the key witness for the prosecution.
There is no doubt that Pettitte will be called upon as a key witness and will play a pivotal role in the outcome of the trial.
At least one company, Chase, apparently already stepped back after it discovered that one of its customers, Wesley Wannemacher, will be a key witness at Wednesday's hearing.
One key witness the British officers hope to question is Andrei Lugovoi, a former Russian intelligence officer, who met with Litvinenko at a London hotel on the day he fell ill in November.
He asked the appeal judges to overturn a number of rulings by the county court, including "two particularly important" ones which excluded evidence relating to DNA analysis and that of a key witness.
The wrangle followed testimony from the Todds' key witness, a deputy medical examiner from Missouri in the US, who faced stringent questioning that saw him revise his position that Shane Todd could have been garrotted.
Hale was a key witness for Starr's prosecutors in the first Whitewater trial which ended with the convictions of former Clinton business partners James and Susan McDougal, and of former Arkansas Governor Jim Guy Tucker.
Mr Kay made the call after ICC chief prosecutor Fatou Bensouda dropped charges against Mr Kenyatta's co-accused, Francis Muthaura, because a key witness had "recanted" his evidence and other witnesses were too scared to testify.
In explaining his decision, Chief Judge Alex Kozinski of the federal 9th Circuit Court of Appeals chided the prosecution for remaining "unconstitutionally silent" on the "history of misconduct" of its key witness, a Phoenix police detective.
During the trial the testimony of the key witness for the prosecution (who had cut a deal with the government for less jail time in return for pointing a finger at a higher-up like Tobin) was effectively impeached.
But he will be a key witness not just about document shredding, but in explaining and guiding federal prosecutors--and perhaps eventually jurors--through the complex transactions and numbing documents that Enron allegedly used to disguise the true nature of its finances.
This key witness - known as witness number four - was present at a meeting where Mr Muthaura and Mr Kenyatta allegedly developed a plan to get the feared Mungiki sect to attack ethnic Kalenjins, seen as supporters of Mr Odinga in 2007.
But a key witness - known as witness number four - who had been due to testify that Mr Muthaura had been present at a meeting where this plan was formulated, has admitted lying and taking bribes and so his evidence has been dropped.
BBC: Francis Muthaura: ICC drops case against Kenyan accused
The prosecution's key witness, the former head of Pakistan's aviation authority, testified that Sharif ordered him to refuse permission for the plane carrying military chief Pervez Musharraf and 200 other passengers to land in Islamabad, even though fuel was running dangerously low, AP said.
The information James claims to have about what went on at the Nicholas residence--and at a warehouse a five-minute drive from the mansion, where a replica of the secret rooms were built--makes him a key witness to the U.S. government, which has charged Nicholas in two separate indictments.
We're pretty sure the key witness in this case was Senior VP of Marketing Phil Schiller, who testified that Apple "had engaged in a practice of naming updates to Mac OS X after large predator cats in order to convey the strength and speed of the operating system" the man speaks truth.
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