Amy Winehouse

Amy Winehouse's father believes his daughter died after suffering a seizure caused by alcohol detoxification, The Associated Press reports.

In a segment taped Friday for Anderson Cooper's new syndicated show, Mitch Winehouse said that he regretted letting the singer try to kick her alcoholism without a doctor's help. As a result, she suffered seizures and would lose consciousness during this period, he said.

No illegal drugs found in Amy Winehouse's body; cause of death still unclear

"The periods of abstinence were becoming longer, and the periods of drinking were becoming shorter," he said in the interview, which will air Monday. "It was heading in the right direction."

Winehouse, who had long battled alcohol and drug abuse, was found dead at age 27 on July 23. An initial autopsy failed to determine the cause of death. No illegal drugs were found in her body, but toxicology reports have shown that alcohol was in Winehouse's system, although it's unclear if it contributed to her death.

Mitch Winehouse added that traces of the Librium, a prescription drug used to fight anxiety and symptoms of alcoholism, were found in her body too.

Amy Winehouse's family says alcohol withdrawal killed her

"Everything Amy did, she did to excess," he said. "She drank to excess and did detox to excess."

An inquest into Winehouse's death is set to begin next month.

Cooper's show, Anderson, premieres Monday.