Some disturbing news came out on Wednesday in an exclusive interview with the head of Jordan Brand and former Portland Trail Blazers executive Larry Miller, as he revealed a very shocking secret he’s been holding for years. In 1965, he shot a fellow teenager dead.

Via Sports Illustrated, who sat down with Miller prior to the release of his book, Jump: My Secret Journey From the Streets to the Boardroom:

“We were all drunk,” Larry Miller said. “I was in a haze. Once it kind of set in, I was like, ‘Oh, shit, what have I done?’ It took years for me to understand the real impact of what I had done.”

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Miller discussed his troubled childhood, when he was in a gang in Philadelphia at just 16 years old. That led to the incident, where he shot a rival gang member dead. The former Blazers president expressed how much he deeply regrets that decision:

“If I could go back and undo it, I would absolutely do that,” Miller says. “I can’t. So all I can do is try to do what I can to help other people and try to maybe prevent this from happening to someone else.”

Larry Miller went on to spend time in prison, where at age 30, he earned an accounting degree from Temple University. Clearly, he has a dark past. But now, Miller is successful as ever and wants others to learn from his past mistakes.