The University of South Alabama Freshman who was killed by the campus police officer for "erratic behavior" was on LSD, authorities said Tuesday.

According to them, 18-year-old Gilbert Thomas Collar was under the psychedelic drug's influence before he allegedly attacked the police officer who shot him after numerous attempts to calm him down.

ng altered sense of time and spiritual experience, though it's not known to cause any brain damage.

At a press conference, Mobile County Sheriff Sam Cochran said that Collar took the drug during a music festival Saturday before assaulting two people in vehicles and attempting to bite a woman's arm.

He then went to the campus police headquarters where he was shot by the officer in the chest. The officer's name has finally been released; he is one Trevis Austin who is on a paid leave.

Cochran also said that as per the acquired video footage, Collar - also a former wrestler - was banging on a door at the headquarters, when Austin heard and came out.

Normally, campus police officers are known to carry pepper spray or any other non-lethal weapon. But, Cochran said Austin had nothing but a firearm during the unforeseen confrontation.

"Had the officer had a Taser or some other less lethal instrument I don't know if that officer would have had an opportunity to shoulder his pistol and to use something else because the events were evolving so rapidly and he was approaching so close," Cochran said.

The University of South Alabama issued a statement Tuesday conveying condolences to Collar's families and emphasized that the administration is cooperating with the authorities in the investigation.

In the meantime, a vigil in Collar's hometown in his honor drew hundreds of current and former students of Wetumpka High School.

"Gil was amazing," said Mark Mathis, who is a junior at WHS and former teammate, to the local newspaper The Wetumpka Herald.

"He was the guy we all wanted to be like when we grew up, even though he was only a couple of years older."

His former wrestling coach Jeff Glass was in tears when recalled about Collar's natural flair for wrestling.

"He was a physical, spiritual and mental warrior. And I love him like my own," he said to the Herald.