Published: Oct 26, 2012 6:21 AM EDT

SANFORD, Fla. (AP) - Prosecutors will ask a judge to impose a gag order in the case of a former neighborhood watch leader accused of fatally shooting Florida teenager Trayvon Martin.
 
Assistant state attorney Bernie de la Rionda is set to argue his motion Friday. De la Rionda says in his court filing that he believes George Zimmerman's defense attorney, Mark O'Mara, has been using a website, social media and news conferences to influence potential jurors.
 
O'Mara launched a website, as well as Twitter and Facebook accounts in April, citing a need to diffuse fraudulent Internet entities that claimed to come from Zimmerman. O'Mara contends he doesn't discuss any specific evidence and has been compliant with all bar rules.
 
Zimmerman is charged with second-degree murder in the February shooting and has pleaded not guilty.