According to reports, ecstacy, alcohol and emphysema led to Amy Winehouse’s death.

Sources told the Sunday Mirror that a “bad” ecstacy pill and a combination of alcohol may have killed the singer.

Though police are operating under the assumption that Winehouse died of a drug overdose, an autopsy is scheduled for Monday or Tuesday.

“When he went to wake her he found she wasn’t breathing,” a Winehouse friend told TMZ. “He called the emergency services straight away. He was very shocked. At this stage no one knows how she died. She died alone in bed.”

Read more at the New York Daily News.