AP Pool Photo
His brother said the former neighborhood watch volunteer was still processing the reality that he wouldn't serve prison time for the killing, which Zimmerman, 29, has maintained was an act of self-defense. A jury found him not guilty of second-degree murder late Saturday night and declined to convict him on a lesser charge of manslaughter.
However, with many critics angry over his acquittal, his freedom may be limited.
"He's going to be looking over his shoulder the rest of his life," Robert Zimmerman Jr. said during an interview on CNN.
Demonstrators upset with the verdict protested mostly peacefully in Florida, Milwaukee, Washington, Atlanta and other cities overnight and into the early morning Sunday, but some broke windows and vandalized a police squad car in Oakland during protests in four California cities, authorities said. Additional demonstrations were scheduled across the country through Sunday evening.
Martin's killing in February 2012 unleashed debate across the U.S. over racial profiling, self-defense and equal justice. Protesters nationwide lashed out against police in the Orlando suburb of Sanford as it took 44 days for Zimmerman to be arrested. Many, including Martin's parents, said Zimmerman had racially profiled the unarmed black teen. Zimmerman identifies as Hispanic.
Six anonymous female jurors considered nearly three weeks of often wildly conflicting testimony over who was the aggressor on the rainy night the 17-year-old was shot while walking through the gated townhouse community where he was staying and where Zimmerman lived.