A 21-year-old Baton Rouge man was convicted early Friday of armed robbery, but the same jury — after initially also finding him guilty of manslaughter and other charges in a fatal police chase-related crash that occurred eight hours after the robbery — ultimately deadlocked after one juror changed her mind on the crash-related charges.

Brian White will be sentenced in October on the armed robbery charge, which carries up to 99 years in prison, but state District Judge Beau Higginbotham declared a mistrial on the charges of manslaughter, aggravated flight from an officer and hit-and-run causing death or serious injury.

East Baton Rouge Parish prosecutors said they will decide after White’s sentencing whether to retry him on the manslaughter and other charges.

Elvin Dunn Jr., of Baton Rouge, was killed when a speeding late-model Mercury Grand Marquis allegedly driven by White and carrying three passengers ran two stop signs and smashed into Dunn’s car at Fairfields Avenue and North 30th Street about 11:40 p.m. Jan. 20, 2014.

Dunn, 37, was ejected and died at the scene. White was 19 at the time.

Shortly before the crash, a police officer tried to stop the Grand Marquis for a traffic violation when it sped off with the officer giving chase.

The jury began its deliberations late Thursday afternoon and returned a verdict of guilty on all counts about 1 a.m. Friday.

The panel was unanimous on the armed robbery count and voted 10-2 to convict White of the other charges.

But when the jurors were polled, or asked to confirm how they voted, one juror changed her vote on the manslaughter and other crash-related counts, making the vote 9-3.

Ten votes were needed to find White guilty on those counts.

After deliberating for another hour without resolving the deadlock, Higginbotham declared a mistrial on those counts about 2 a.m.

Melvin Morgan, 19, who authorities say was driving the Grand Marquis at the time of the armed robbery, is set for trial March 21 on an armed robbery charge.