Published: Jul 10, 2013 11:50 PM EDT

SANFORD, Fla. (AP) - George Zimmerman's attorney says the neighborhood watch is "worried" about the possibility of a life sentence if he's convicted on second-degree murder in the shooting of Trayvon Martin.
    
The defense wrapped up its case Wednesday without Zimmerman taking the stand. Attorney Mark O'Mara says his client wanted to testify but the defense team felt he had already told his version of events in multiple police interviews played for jurors. Zimmerman maintains he shot Martin in self-defense as he and the 17-year-old fought.
    
Earlier in the day, the judge made two rulings preventing the defense from introducing as evidence text messages from Martin's cellphone and an animation depicting Zimmerman's version of his fatal fight with Martin. Judge Debra Nelson ruled that the texts were irrelevant. She will allow the animation to be used as part of the defense's closing argument.
    
They're set to begin Thursday, and the judge says the six-person jury could get the case as early as Friday.