Unfortunately, our valuable witness was making no sense to anyone.

His manner showed that he might prove a valuable witness.

Yet, given its limitations, his brief catalog is a valuable witness.

In that event, Rann certainly would not have been a valuable witness for the prosecution.

This is what makes Cathy Young such a valuable witness - from both ends of the telescope.

He could be a valuable witness to the horrors inflicted in America on more than 1.6 million prisoners - the largest number of any nation.

However, they could be valuable witnesses who may have seen something of interest.

And you must acknowledge that in the circumstances it is useful to have such a valuable and efficient witness.

That's rotten luck to have your most valuable witness killed.

There would be an exceedingly valuable witness, don't you think?