However, the police said, the men were not the killers, but important witnesses.

"Only that there is an important witness whom you have not seen."

Such a man would be a most important witness for you.

However, of all the passengers on that train, none could have been a better or more important witness.

At least three important witnesses died before the trial got under way.

I had to go direct from home to interview an important witness.

It is expected to subpoena important witnesses in the next few weeks.

We have an important witness, but she must be safeguarded.

When an important witness will not cooperate, nothing can be done.

The castle is an important witness to the architecture of the period.