Alcohol poisoning killed Amy Winehouse.
http://www.eonline.com/news/amy_winehouses_cause_of_death/271628
Alcohol poisoning took her life in the end...but drugs destroyed her body long before that as was explained by her
doctor and Winehouse’s father confirmed this.
BTW Winehouse began drugs at a young age....about 15 I believe....she was high from the get go of her career in music.