One of the jurors who convicted Michael Dunn of attempted murder after he fired into an SUV during a fatal argument over loud music believes he should have been convicted of first-degree murder. "I believed he was guilty," Valerie said in an interview with ABC's "Nightline" early Wednesday.

Also known as juror No. 4, she asked that her full name not be given in order to protect her identity. A jury on Saturday night convicted Dunn of three charges of attempted murder for shooting at three teenagers in an SUV and one count of shooting into the vehicle on November 23, 2012. But a separate murder charge in the death of 17-year-old Jordan Davis resulted in a hung jury. Prosecutor Angela Corey said she would seek a new trial on the charge. 

Dunn faces 60 years or more in prison for the attempted murder charges when he's sentenced next month. 

On the murder charge, Valerie said the jury split over the issue of self-defense. Florida law says the use of deadly force is justifiable if someone reasonably believes that the force is necessary to prevent imminent death or great bodily harm. In his testimony, Dunn insisted that Davis threatened him and that he saw a gun. Police never recovered a weapon. Valerie said the jury's first vote was 10-2 in favor of a murder conviction. Over nearly 30 hours of deliberations, the vote became 9-3.