The girlfriend of former Anheuser-Busch CEO August Busch IV died at his home after accidentally overdosing on the painkiller oxycodone, the St. Louis County medical examiner said Wednesday.

Adrienne Martin, 27, of St. Charles, was found dead on the morning of Dec. 19 at Busch’s sprawling estate in suburban St. Louis after spending the night at his home. He has said he woke up around 11 a.m. and tried to awaken Martin, but couldn’t.

Oxycodone is used to relieve moderate to severe pain, according to the National Institutes of Health. It is in a class of medications called opiate (narcotic) analgesics and works by changing the way the brain and nervous system respond to pain. It is commonly known by its brand name, OxyContin.

The Drug Enforcement Administration says abuse of Oxycodone has increased markedly in recent years.

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