UPDATE:  An autopsy report released Wednesday details what contributed to the death of a University of Tennessee student who collapsed and died last month during a fraternity boxing tournament.

The report says Tanner Wray, 20, died of "cardiac arrhythmia due to dilated cardiomyopathy of hypertensive etiology."

According to the report, chronic combined amphetamine (Adderall) and caffeine use is considered the signification condition contributing to his death.

The manner of death is natural, the autopsy report says.

Friends and family told the medical examiner's office that Wray had been taking unprescribed Adderall for some time in order to lose weight and qualify for the match, according to the autopsy report.

Before the match, the report says he drank an energy drink which had a large amount of caffeine in it.

Wray allegedly prepared and trained for the popular event "rather intensely for several months."

His mother said he had no underlying medical condition, and that he had been training for the event since October.

Read more from WBIR's website.

PREVIOUS STORY: The Knoxville Police Department is investigating Saturday as the Vol community mourns the death of a student at a Friday night fundraising boxing match.

The second night of the annual Boxing Weekend tournament billed as "the biggest party weekend in the South", was called off early Friday after boxer Tanner Wray collapsed between rounds and was taken away for medical attention.

Twenty-year-old Tanner Wray, an aerospace engineering student from Lawrenceburg, Tenn., was walking to his corner after the end of the second round at the Knoxville Expo Center on Clinton Highway when he collapsed on the mat and didn't get up.

Wray was pronounced dead at University of Tennessee Medical Center.

KPD says an autopsy will be performed to determine Wray's cause of death.

Students have already begun sharing their condolences on social media.

Chi Phi fraternity, for whom Wray was boxing, says Wray served as a vice president at the organization's UT chapter. The fraternity's national chapter posted to its website saying, "Our thoughts are with Tanner’s family and friends, the Phi Delta Chapter, and the Vols community."

UT Chancellor Beverly Davenport tweeted her condolences to Wray's loved ones Saturday morning.

Also reacting to Wray's death was Josh Dobbs, the former UT quarterback who also was an aerospace engineering major.

"This is devastating! Praying for Tanner and his family!" Dobbs, now playing for the Pittsburgh Steelers, tweeted Saturday.

The University of Tennessee is offering counseling resources for students dealing with Wray's death. University officials say the Counseling Center staff is available to meet with both individuals and organizations seeking help. Students can also call 865-974-HELP, a 24/7 referral service for individuals concerned about the safety and well-being of others.

The Ace Miller Memorial Boxing Tournament is an amateur event for UT fraternity members.The tournament is not organized through the university.

10News reporter John North said a doctor at the match jumped into the ring immediately after Wray collapsed. A medical crew treated him for several minutes before taking him away on a stretcher.

Read more from WBIR's website.