Authorities say they are dropping their aggravated assault case against George Zimmerman after his ex-girlfriend stopped cooperating with authorities.

State Attorney Phil Archer said Friday that he wouldn't file a formal charge against Zimmerman, the former neighborhood watch leader who was acquitted of killing Trayvon Martin.

The killing of the unarmed black teen touched off protests across the country.

Zimmerman was arrested earlier this month after his ex-girlfriend told police officers he had thrown a wine bottle at her. She later recanted her story.

It was Zimmerman's latest run-in with authorities since his acquittal in 2013.