Robert Downey Jr.'s attorneys have failed to negotiate a plea bargain for the drug charges against him, Reuters reports. That means a preliminary hearing must be held on April 30, when a judge will decide if there's enough evidence to bind Downey for trial. The trouble began at a Palm Springs resort on Nov. 25, when an anonymous 911 call led to the Ally McBeal star's arrest for possession of cocaine and Valium. If convicted, he could go back to prison for nearly five years.