Eubanks' death follows the apparent suicides of two students who survived the February 14, 2018, mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, and the apparent suicide of a father whose young daughter was killed in the shooting rampage at Sandy Hook Elementary School in Newtown, Connecticut, on December 14, 2012.
In treating his injuries, Eubanks was heavily medicated, and he told CNN that he quickly developed an addiction to the pain medication after being drawn to the way it numbed his emotions following the traumatic experience. The perpetrators shot both him and his friend Corey DePooter in the library. Then he became addicted to them.
He said that the event led to an opioid addiction that lasted into his 20s.
He said: As a survivor of the Columbine tragedy nearly two decades ago, I'm no stranger to pain - both physical and emotional.
"Helping to build a community of support is what meant the most to Austin, and we plan to continue his work", they told the station. Eventually, he found a path to recovery, and he chose to dedicate himself to helping others who were in the same position as him.
He later worked at an addiction treatment centre and travelled across the United States telling his story.
His death comes barely a month after the 20th anniversary of the Columbine shooting, which happened on 21 April 1999.
About eight years ago, Eubanks said he decided to make a change. An attendee at the conference tweeted that hearing him speak had been an "amazing experience" and that his story had been "captivating".
It was, at the time, the deadliest school shooting in U.S. history.
It is unfortunate that Austin has lost his battle with the disease he tried to help other people face. The school includes a program called Summit House which aims to help teenagers who are struggling with addiction or related disorders. "Through strong community partnerships and a vibrant, positive school culture, students in Summit House gain the understanding required for life-long recovery, and are equipped to thrive in college, career, and civic life".