A grand jury has decided not to charge a University of South Alabama campus police officer in the fatal shooting of a naked student.

The jury reached a decision Friday and said surveillance video proved Officer Trevis Austin was justified in shooting Gil Collar. Police said collar was naked and banging on a window at a campus police station Oct. 6. Austin, who went outside to investigate the sound, said Collar was acting erratically and lunged toward him.

A grand jury report says Collar had ingested a small amount of a chemical substance similar to LSD that may have caused him to act erratically. Mobile County District Attorney Ashley Rich says the substance is not on Alabama's list of controlled substances, so she doesn't have jurisdiction to bring charges against the supplier.