Michael Dunn returns to the courtroom during jury deliberations in his trial in Jacksonville, Fla. , Thursday Feb. 13, 2014.
JACKSONVILLE - The jurors in Michael David Dunn's murder trial may be deadlocked on at least one of his five charges after roughly 22 hours of deliberations, and they will report back to the Duval County Courthouse about 9 a.m. this morning to continue discussion.
Dunn faces charges of first-degree murder, three counts of first-degree attempted murder, and one count of shooting or throwing a deadly missile. Jurors can also consider lesser charges of second-degree murder, manslaughter, second-degree attempted murder and attempted manslaughter.
The 47-year-old South Patrick Shores software developer shot and killed Jordan Davis, 17, during a November 2012 Jacksonville parking-lot confrontation over loud rap music.
Prosecutors said Dunn fired 10 bullets at a sport-utility vehicle containing Davis and three other black teenagers. Dunn testified on the witness stand that he feared for his life and thought Davis was armed with a shotgun. But detectives said no weapon was found in the SUV.
STORY: Jury meets for third day in Dunn trial
Dunn's trial started Feb. 3, and jury deliberations began Wednesday. About 4:50 p.m. Friday, Circuit Judge Russell Healey announced that the jury had a question: Is it possible to not reach a verdict on one count and reach a verdict on other counts?
"The answer to that is yes," Healey said.
If jurors deadlock on a count, for example, Healey said jurors could publish verdicts on the other four counts. A mistrial would be declared on the deadlocked count. Prosecutors could later retry Dunn on that count, at their discretion.
Including meal breaks, the jury deliberated about 3 hours Wednesday and nearly 9 hours Thursday before resuming work about 9 a.m. Friday. The jury is composed of four white men, four white women, two black women, one Asian female and one Hispanic man. There are also four alternate jurors.
At 6:50 p.m. Friday, the jury told Healey that it had "reached a wall." Deliberations ended for the night, and the jurors were driven back to their hotel.
"This is one admirable group, I'm telling you what," Healey said. "They're clearly taking this thing as seriously as they should. And I couldn't be more proud for how hard they're working and the number of hours that they've been deliberating to try and resolve this case."
See also: Trayvon Martin's parents offer support of Davis
Dunn's jury has now deliberated longer than their counterparts during Central Florida's Casey Anthony and George Zimmerman trials. Journalists and spectators passed time Friday on the fourth floor of the Duval County Courthouse, looking at their phones and taking brief walks to stretch their legs.
Based on his research, Healey said it appears that jury deliberations can continue on Sunday, if necessary. Sunday would have been Davis's 18th birthday.
"We don't really want the jury's verdict to come down on his birthday. But it may be that way," his father, Ron Davis, said on the courthouse steps after deliberations ended.
More Florida 'loud music' trial coverage:
WATCH: Coverage of Michael Dunn trial in Jacksonville
-Florida's next Trayvon Martin case?
-Echoes of Zimmerman expected in FL murder trial
-Man claims fear led to slaying over loud music
-DAY 1: Prosecutor says Dunn was unconcerned after shooting
-DAY 2: Testimony focuses on rap music confrontation
-DAY 3: Jacksonville Police officer takes the stand
-DUNN'S FIANCE: Emotional Testimony
-DAY 4: Prosecution rests case vs. Dunn