Come to think of it, I remember that. There was a Grand Jury hearing but they returned no indictment. The housekeeper was called in and tried to write a book on it but they said she couldn't talk about what she said to the GJ b/c no indictment was returned.
That GJ was investigating the Ramseys, not Karr. All public indications are that Karr did not come to the Boulder DA's attention until that Colorado professor contacted them. BTW, that professor certainly also seems obsessed with the Ramsey case and is a weird duck, himself.