Eubanks, who was found dead last month during a welfare check after he didn’t answer his phone, was 37.
Eubanks’ death has been “ruled an accidental heroin overdose,” Routt County, Colorado, Coroner Robert Ryg, told CNN Thursday.
“I’m very sad about it myself,” Ryg said. “We were hoping for something else, heart attack or something.”
Opioids ‘took the emotion away,’ Eubanks said
Eubanks was 17 at the time of the Columbine shooting, KMGH said.
He was in the library with his friends, trying to decide whether they were going to go fishing or play golf after school, when they heard the sound of gunshots.
Eubanks, his best friend and a couple of other students hid under the same table. About 10 minutes later, the shooters entered the library and methodically fired under each table, Eubanks said. He was shot in the hand and knee. His best friend was killed instantly.
“Obviously, after that, my life took a pretty big detour,” Eubanks said.
“As a result of my injuries, I was pretty significantly medicated about 45 minutes after being shot. I remember immediately being drawn to that feeling, because it took the emotion away,” he said of the pain medication.
Within a matter of weeks, he said, he developed an opioid addiction.
Eubanks continued to struggle with addiction in his 20s, he said. Then, after multiple attempts at residential treatment, he found long-term recovery and decided to devote his time to speaking out about addiction recovery.
CNN’s Hollie Silverman and Jacqueline Howard contributed to this report.