¶1*419Ronald P. Sokol, Charlottesville, Va. (Court-assigned counsel), for appellant.
¶2Joseph R. Cruciani, Asst. U. S. Atty. (William Medford, U. S. Atty., on brief), for appellee.
¶3Before BOREMAN and J. SPENCER BELL, Circuit Judges, and SIMONS, District Judge.
¶5James Boyce appeals from a judgment of the District Court for the Western District of North Carolina entered upon a jury verdict finding him guilty of a conspiracy1 to transport worthless securities in interstate commerce.2 The conspiracy indictment returned by the grand jury in this ease named four conspirators: Boyce, Logan, Hill, and Ellis.3 All except Ellis pleaded not guilty to the conspiracy charge at their arraignment; Ellis entered a guilty plea.4 Later, with the court’s approval, Logan changed his conspiracy plea to guilty,5 and the conspiracy trial thereafter proceeded solely against Boyce and Hill. During a trial which lasted three days, the Government called 47 witnesses who testified to numerous separate fraudulent banking transactions alleged to have grown out of the conspiracy. Most of these transactions, however, did not involve the physical presence of Boyce. Neither Boyce nor Hill took the stand or presented any evidence; and at the close of the evidence, the jury returned a guilty verdict on the conspiracy charge against both defendants. Boyce was sentenced to five years imprisonment, while each of the other three conspirators received a sentence of fifty months.6
¶6The Government’s evidence tended to show that the defendants were defraud*420ing banks first in Maryland and New Jersey and later in North Carolina by the use of worthless checks and raised commercial money orders. The defendants purportedly were depositing or cashing altered commercial instruments or cheeks drawn on fictitious accounts in out-of-state banks.
¶7During the course of the trial and after the guilty pleas of both Ellis and Logan, the Government oífered a signed confession made to F.B.I. agents by Ellis after his arrest. This confession not only implicated Boyce in the conspiracy, but it also clearly implied that he was the ringleader.7 Boyce’s counsel strenuously objected to the introduction of the confession, pointing out to the court that it was admissible only against Ellis and that Ellis had pleaded guilty. In spite of the fact that its attention was directed to these facts, the court admitted the statement. When counsel for Boyce later moved that the document be stricken from the record, the court replied: “I have told the jury that the evidence is only competent against Ellis. He has pleaded guilty and so has one other. Still, the Government can offer all the evidence it has, and that is what [it] has done, I assume.” 8
¶8The admission of Ellis’ confession in this case was clearly prejudicial error,9 Gambino v. United States, 108 F.2d 140 (3 Cir. 1939), and therefore no question of the application of Rule 52(a) of the Federal Rules of Criminal Procedure 10 arises. If there is only a reasonable probability that the confession was prejudicial to Boyce, his conviction cannot stand. Cf. Fahy v. Connecticut, 375 U.S. 85, 86-87, 84 S.Ct. 229, 11 L.Ed.2d 171 (1963). Certainly that probability is present here.
¶9The confession by Ellis bore directly upon the existence of a scheme or plan and wove together the many alleged individual acts of fraud committed by the four defendants against the banking institutions involved. Furthermore, it indicated that Boyce was the instigator and leader of this illegal enterprise. This extrajudicial statement was pure hearsay, which the appellant was entitled to have excluded, and its admission entitles Boyce to a new trial. Gambino v. United States, supra.
¶10Boyce has alleged other errors in his trial, including the court’s definition of reasonable doubt in its charge to the jury as a doubt “for which you can have a reason and do have a reason … Without passing on this point, we observe that attempts to improvise definitions of reasonable doubt have usually led to trouble and are best avoided. Pettine v. Territory of New Mexico, 201 F. 489, 496 (8 Cir. 1912); see also the opinion in Owens v. Commonwealth, 186 *421Va. 689, 43 S.E.2d 895, 902-03 (1947), and the numerous cases cited therein.
¶11A new trial for Boyce alone will avoid the other questions raised on this appeal. We therefore find it unnecessary to decide them.
¶12Reversed and remanded.