R.C. 2945.39 is constitutional
Section 2945.39 "along with its related statutes, authorizes a common pleas court to exercise continuing jurisdiction over a criminal defendant who has been charged with a violent first- or second-degree felony and who has been found incompetent to stand trial and remains so after the expiration of R.C. 2945.38's one-year time frame for restoring competency. R.C. 2945.39 authorizes the common pleas court to order the involuntary commitment of such a person in a mental-health facility when the statutory criteria are met." State v. Williams, 2010-Ohio-2453.
Today the Ohio Supreme Court held that R.C. 2945.39 is civil in nature, it is constitutional, and "a person committed under the statute need not be afforded the constitutional rights afforded to a defendant in a criminal prosecution."
Read the decision here, view the oral argument here or read the Second District Court of Appeals decision here.