It was NOT in open court, only delivered to the Judge; From the Syllabus:
Held: The Double Jeopardy Clause does not bar retrying Blueford on charges of capital murder and first-degree murder. Pp. 5−10.
(a) The jury did not acquit Blueford of capital or first-degree murder. Blueford contends that the foreperson’s report that the jury was unanimous against guilt on the murder offenses represented a resolution of some or all of the elements of those offenses in his favor. But the report was not a final resolution of anything. When the foreperson told the court how the jury had voted on each offense, the jury’s deliberations had not yet concluded. The jurors in fact went back to the jury room to deliberate further, and nothing in the court’s instructions prohibited them from reconsidering their votes on capital and first-degree murder as deliberations continued. The foreperson’s report prior to the end of deliberations therefore lacked the finality necessary to amount to an acquittal on those offenses. That same lack of finality undermines Blueford’s reliance on Green v. United States, 355 U. S. 184, and Price v. Georgia, 398 U. S. 323. In both of those cases, the verdict of the jury was a final decision; here, the report of the foreperson was not. Pp. 5−8.
I have never seen/read where a person was charged more than 4 times in a retrial, that would seriously trigger Due Process. After 4 and a hung jury, the govt. is basically estopped from another trial.