Once the accused has been arraigned (formally charged in court), the defense is entitled to discovery of all witnesses and evidence that the prosecution intends to introduce. The prosecutor doesn't need to turn over everything they have, just everything that they may use at trial. The exception to this would be any exculpatory evidence that the prosecutor may be aware of even if he, obviously, would not be introducing it at trial.
Until she's arrested and charged,Terri isn't entitled to know anything. Unless Houze is sleeping with and/or paying off someone within the sheriff's or prosecutor's office who doesn't care much about retaining their employment, it's unlikely that he has any better idea of what the prosecution's case may be than we do. The only inside window he probably has at this point is knowledge of the lines of questioning LE has taken with Terri and the assumptions to be drawn from that.