Ohio Crim. R. 14
If it appears that a defendant or the state is prejudiced by a joinder of offenses or of defendants in an indictment, information, or complaint, or by such joinder for trial together of indictments, informations or complaints, the court shall order an election or separate trial of counts, grant a severance of defendants, or provide such other relief as justice requires. In ruling on a motion by a defendant for severance, the court shall order the prosecuting attorney to deliver to the court for inspection pursuant to Rule 16(B)(1) any statements or confessions made by the defendants which the state intends to introduce in evidence at the trial.
When two or more persons are jointly indicted for a capital offense, each of such persons shall be tried separately, unless the court orders the defendants to be tried jointly, upon application by the prosecuting attorney or one or more of the defendants, and for good cause shown.
Ohio. Crim. R. 14