Convincing the jury of who was screaming for help on the 9-1-1 tape became the primary goal of prosecutors and defense attorneys because it would help jurors evaluate Zimmerman's self-defense claim.
Zimmerman's father, Robert Zimmerman Sr., was the last witness called by the defense yesterday, and he said it's his son yelling for help on the call.
Defense attorneys also called a forensic pathologist who testified that the forensics evidence supports Zimmerman's account of what happened.
Zimmerman has pleaded not guilty to second-degree murder. On the night of the fatal scuffle in February 2012, Martin was visiting his father and his father's fiancee at the same townhome complex where Zimmerman lived.
Zimmerman observed Martin while driving in his neighborhood, called police and the fight ensued after the neighborhood-watch volunteer got out of his vehicle.
Some civil-rights activists argued that the delay in charging Zimmerman was influenced by Martin's race, and protests were held around the nation in the 44 days between the fatal fight and Zimmerman's arrest. Martin was black and Zimmerman identifies himself as Hispanic.
The defense rested on a day when the judge made two rulings that prevented them from introducing pieces of evidence. Defense attorneys had wanted to present text messages discussing fighting from Trayvon Martin's cellphone and an animation depicting Zimmerman's fatal fight with Martin. But Nelson sided with prosecutors, who had argued the animation is inaccurate and the texts were irrelevant.
Immediately after the defense rested, prosecutors called their first rebuttal witness - Adam Pollock, the gym owner who had trained Zimmerman. But prosecutors decided not to question Pollock after the judge presiding over the case ruled he couldn't be questioned about a video put on his gym's website showing his court testimony at the trial.
Shortly after, court was adjourned until this morning.
Earlier yesterday, a former neighbor of Zimmerman's, Olivia Bertalan, described how he had helped her find a lock for her townhome's sliding door and offered any help he could after burglars broke into her home.
"I was just appreciative he was offering a hand and said I could spend time with his wife if I wanted to during the day," she said.