To win a second-degree murder conviction, prosecutors must prove Zimmerman showed ill will, hatred or spite — a burden the defense has argued the state failed to meet. To get a manslaughter conviction, prosecutors must show only that Zimmerman killed without lawful justification.
Allowing the jurors to consider manslaughter could give those who aren't convinced the shooting amounted to murder a way to hold Zimmerman responsible for the death of the unarmed teen, said David Hill, an Orlando defense attorney with no connection to the case.
"From the jury's point of view, if they don't like the second-degree murder — and I can see why they don't like it — he doesn't want to give them any options to convict on lesser charges," Hill said of the defense attorney.
Under Florida's laws related to gun crimes, manslaughter could end up carrying a penalty as heavy as the one for second-degree murder: life in prison.
It is standard for prosecutors in Florida murder cases to ask that the jury be allowed to consider lesser charges that were not actually brought against the defendant. And it is not unusual for judges to grant such requests.
Prosecutor Richard Mantei also asked that the jury be allowed to consider third-degree murder, on the premise that Zimmerman committed child abuse when he shot the underage Martin. Zimmerman's lawyer called that "bizarre" and "outrageous," and the judge sided with the defense.
As the nation awaits a verdict in the trial, police and city leaders in Sanford and South Florida say they have taken precautionary steps for the possibility of mass protests or even civil unrest if Zimmerman, who identifies himself as Hispanic, is acquitted, particularly in African-American neighborhoods where passions run strongest over the case.
There were massive protests in Sanford and other cities across the country when authorities waited 44 days before arresting Zimmerman.