London, Aug 7 (IANS) The wife of China's fallen political star Bo Xilai has confessed to killing British businessman Neil Heywood last November, a media report said Tuesday.

Gu Kailai had also confessed to economic crimes, the Telegraph quoted a South China Morning Post report as saying.

In an interview with the Post an anonymous source - who was part of the team probing the alleged murder - also said Gu appeared gracious and relaxed.

Gu, the wife of former party secretary of Chongqing, is expected to go on trial for murder in China's Hefei city Thursday.

Alongside her will be Zhang Xiaojun, a household aide and bodyguard, whose family lawyer told the Telegraph his client did not initiate Heywood's suspected poisoning.

Gu told investigators everything she could remember and, as for those accusations about which she couldn't remember clearly, she asked the investigators to go ahead and write up anything they'd like to, the source said.

The same source said the only physical evidence prosecutors had been able to gather was a piece of Heywood's heart, removed by Chongqing's former police-chief, Wang Lijun, before the 41-year-old's body was cremated.

The prosecutor claimed although Gu had confessed to economic crimes, her official indictment suggests she will only be accused of intentional homicide at the trial.