He has not been charged and is expected to be the prosecution's main witness.

Three of the main witnesses at that trial are now dead.

The defense will also do what it can to attack the credibility of the government's main witnesses.

If he goes to trial, his mother will be the main witness against him.

The main witness in the case is no doubt the river itself.

When Mason goes to the apartment of the main witness, all he finds is a very dead body.

"The main witness here may have a tax problem of his own."

The police also failed to look for the man whom the main witness had first implicated.

"The main witnesses were drug dealers, and they couldn't say anything."

Europe must be the main witness to what is the rule of law.