Are "expert" witnesses ever held responsible?

A discussion in another thread started me wondering -
If a court decides to let a person, who has committed some sort of violent crime, out of a mental institution based on testimony given by a psychiatrist who says that society has nothing to fear from this person, and the person then commits another crime; is that psychiatrist accountable?
As I understand it, one can find an expert witness to match what either the prosecution or defense want to prove, so the poor dope making the final decision still has a tough decision to make. The one psychiatrist had this to say in the article from the other thread; “There is no reason, either medical or in terms of the danger he poses, that he should stay in hospital,”
That’s a pretty ballsy statement. Does this person have anything riding on the veracity of his statement?
Is there a precedent for this? Can he be held responsible?