(YAHOO) Testimony resumes for a fourth day on Thursday in the George Zimmerman murder trial in Sanford, Fla. Zimmerman is accused of profiling, pursuing and fatally shooting Trayvon Martin, an unarmed black teen, in February 2012. Zimmerman, a former volunteer crime watchman in Sanford, Fla., has pleaded not guilty, saying he shot in self-defense when Martin attacked him.

Warning to viewers: profanity is sometimes used and violent images are being shown in the courtroom