SANFORD, Fla. (AP) — George Zimmerman, the neighborhood watch volunteer who fatally shot unarmed black teenager Trayvon Martin in Florida, will be charged in the 17-year-old’s death, a law enforcement official said Wednesday.

Special prosecutor Angela Corey will announce charges against the 28-year-old Zimmerman at a 6 p.m. Wednesday news conference, the official with knowledge of the investigation told The Associated Press. Corey confirmed that an announcement on the case would be made in Jacksonville but didn’t elaborate. The person said Zimmerman’s arrest is also expected soon.

The official didn’t know the charge and spoke on condition of anonymity because he wasn’t authorized to release the information.