Amy Winehouse, a British singer whose unidentified death at her London flat has stormed the media with speculations, was reportedly in possession of several drugs, namely Ecstasy, Cocaine and Ketamine.

Amy Winehouse was found dead in her London flat on Saturday. Police have not identified the cause of her death, but Winehouse publically battled with drugs and alcohol, and police reports indicate she fought her final battle.

"Police were called by London Ambulance Service ­shortly before 4.05pm (GMT) following reports of a woman found deceased. ­Officers found a 27-year-old female who was pronounced dead at the scene," a spokesman for ­Scotland Yard said. "This looks like she has died after a drink and drugs binge."

The 27-year-old troubled singer allegedly bought drugs from a dealer in Camden just after 10:30 p.m. on Friday, reported the Daily Mail. Winehouse was seen buying cocaine, heroin, ecstasy, ketamine, and possibly heroin, said a source of The People.

Multiple media outlets claim that she was drinking heavily in her final hours, causing a lethal concoction of drugs and alcohol.

"Amy seemed determined to have a big one on Friday night. She was out in Camden on Friday evening, but seemed determined to carry on the party back at her flat,"said the source.

Ketamine, a drug less known than Ecstasy or marijuana, could cause dream-like states and hallucinations. In high doses Ketamine can cause delirium, amnesia, impaired motor function, high blood pressure, depression and potentially fatal respiratory problems, says Gina Tenorio of Loma Linda University. According to the report, ketamine occasionally caused nightmares in adults.

In what is acknowledged to be her last public appearance, Winehouse joined her protégé and goddaugher Dionne Bromfield onstage at the iTunes Festival on Wednesday evening. Winehouse didn't perform herself, but danced and clapped along to Bromfield's performance and encouraged the audience to buy her record. At Bromfield's prompting, she pitched in to the chorus of 'Mama Said', but her voice was barely audible.

Coming on stage, Winehouse stumbled around as if she was drunk or under the influence of drugs, fan Simon Grabiner told The Daily Mail.

'Everyone cheered as they saw her come on, and everyone thought she was going to perform. But she just walked around the stage as if she was drunk or something," said Grabiner. "Her legs seemed to turn to jelly. She gave Dionne a hug, and told everyone to buy her album. Then she just walked off."

Not so later in the week, when neighbors reported seeing her fall out of a taxi cab, having been out with Big Brother star Aisleyne Horgan-Wallace. Witnesses said Winehouse needed to be carried inside.

"There was always a danger of something like this," another friend told The Mirror. "Her drinking is totally out of control. She's constantly out of ­control on vodka. She'd drink bottle after bottle and ­mixing those ­quantities with drugs is lethal."

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Amy Winehouse (REUTERS)