Sarah, I don't know about the mental committment statutes in Utah, but I do know about them in my state (Wisconsin). Once a person is either adjudicated mentally ill by a jury or judge or has an involuntary committment, the case is reviewed every six months. If the person who's committed can convince a psychologist or psychiatrist that that person is sane, there's a review hearing and if the judge agrees, the person is released. Yup, they walk.
This would've applied to Jeffrey Dahmer had the jury found him insane by reason of mental disease or defect. In fact, our county has a man on trial right now for the murder of two police officers--he rammed his truck into their parked police car. If he's found guilty (and he's admitted he did it), they'll move into the "is he crazy or is he sane" part of the trial. If he's found insane, he goes to the state mental hospital with the same terms--a review every six months. Because Tyson Kruescher is claiming he's depressed and wasn't taking his meds, because he's on his meds now, if they find that he was insane at the time of the crime, how long do you think it'll be before he's out of the state mental hospital? Yup, six months--six months for two murders.