Hospital blood and urine tests also detected the presence of marijuana, according to a statement from East Baton Rouge Parish Coroner Beau Clark's office.
The process of initiating applicants - or "pledges" as they are known - involves events which include alcohol, and has led to the deaths of several USA students in recent years.
Alexander said he wasn't aware of any arrests made in connection with the freshman's death. We are investigating this matter with the utmost seriousness.
Gruver was a graduate of Blessed Trinity Catholic High School.
"We are investigating this matter with the utmost seriousness...as we have continually warned hazing is risky, irresponsible and unacceptable", Alexander contended.
"The death of Maxwell Gruver was tragic and untimely", F. King Alexander, the university's president, said in a statement. Officials say the fraternity, which is on the university campus, did not have any registered events with the school on Wednesday.
The fraternity contacted LSU's Greek Life office about 12:15 p.m.to inform them of an incident.
Just a year ago, LSU officials put the fraternity Lambda Chi Alpha on probation after two new members were sent to the hospital in the spring, KATC reported. "The chapter and any individuals who are found to have violated our policies will be held accountable", Executive Vice President and CEO Bob Biggs said. It was founded on campus in 1938, according to LSU's Division of Student Affairs.
"A young man's life was cut short last night and we mourn the loss and the possible impact he may have had on our region and the world", he said. "Our deepest sympathies and prayers go to his family and his friends", Alexander added.