JACKSONVILLE, Fla. -- There are calls for Florida State Attorney Angela Corey to step down. She led the state's case against Michael Dunn, whose trial on first degree murder charges ended with a hung jury.

Dunn was accused in the shooting death of a Marietta teen - Jordan Davis - who would have celebrated his 19th birthday on Sunday.

The jury did convict Dunn late Saturday on three counts of attempted second degree murder and one count of shooting into an occupied vehicle.

MORE |The trial of Michael Dunn, accused of killing a Marietta teen over loud music

Minutes after the verdict was read, protesters flooded the Jacksonville courthouse.

"The criminal justice system is not perfect. It's the best there is, but it's certainly not a perfect system," said former DeKalb County Prosecutor J. Tom Morgan.

Morgan says he was not surprised the jury was hung on the first degree murder charge.

"We all know that jurors like to compromise, so this could be a compromise verdict," he said.

The so-called compromise didn't leave either side happy, with Michael Dunn's attorney saying they will appeal, and Jordan Davis' family pleading for justice for their son.

"And we will continue to stand. And we will continue to wait for justice for Jordan," said Davis' mother, Lucia McBath.

Corey says her office will retry Michael Dunn on first degree murder charges, but with Dunn already facing more than 70 years in prison, it's a decision Morgan questions.

"There is certainly a diminishing return in the criminal justice system, and there are limited resources," Morgan said.

Corey's office oversaw the prosecution in the George Zimmerman murder case in 2012. Zimmerman was acquitted in the death of teenager Trayvon Martin, who was shot to death in a Sanford, Fla. Subdivision in early 2012.

Morgan says getting the first degree murder conviction in this case would have been redemption for Corey.

"Her political career is at stake here, and that might be clouding her judgment as to whether this case should have a second go round," said Morgan.

Dunn will be sentenced on the other charges in March.

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