Austin Eubanks, a victim of the 1999 Columbine school massacre who became a prominent campaigner on the danger of opioids after he developed an addiction to painkillers, has died. He was 37.

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Eubanks was found in his home in Steamboat Springs, Colorado, and his death confirmed by a coroner on Saturday.

Though the cause of death was not known ahead of an autopsy on Monday, Eubanks’ family told the local ABC TV station, Denver 7, he had “lost the battle with the very disease he fought so hard to help others face.

“Helping to build a community of support is what meant the most to Austin,” they said, “and we plan to continue his work.”

Eubanks’ death came less than a month after the 20th anniversary of the Columbine massacre in which 12 pupils and a teacher were killed by two students.

Facebook Twitter Pinterest On 25 April 1999, Eubanks hugs his girlfriend during a memorial service in Littleton, Colorado. Photograph: Bebeto Matthews/AP

He was in the library of the high school on 20 April 1999 when the two shooters entered. Ten students, including Eubanks’ best friend Corey DePooter, died before the gunmen turned their firearms on themselves. One student died later.

Eubanks, then 17, was shot in the hand and knee. He once said that though in hindsight his injuries were not that severe he was prescribed prescription medicines to control the pain and within three months had become addicted.

He said the dependency was not so much physical but emotional. In a 2016 interview with Denver 7 he said: “I didn’t know any better. I was 17 years old, and I had been given medication to feel better.

“Immediately I learned that if I took substances, I didn’t have to feel, I didn’t have to feel the emotional pain.”

It took him 12 years to find a way out of addiction, and after that he used his dramatic personal story to try and help others fight drug dependency. He became a prominent expert on addiction and drug policy, travelling the country to advise those going through trauma that it is better to face emotions than dull them behind painkillers, as he did.

After the mass shooting in Parklands, Florida, in February last year, he had a message for his fellow survivors: “With emotional pain, in order to heal it, you have to feel it.

“It’s not like a physical injury that you can medicate and still recover. In order to heal emotional pain, you have to be present and you have to go through the stages of grief.”