An American who drugged her investment banker-husband with a milkshake and bludgeoned him to death more than seven years ago has been convicted of murder by a Hong Kong court.

It was her second trial in a case that grabbed attention with lurid details on the breakdown of a wealthy expatriate marriage in the former British colony.

Nancy Kissel was sentenced to life imprisonment.

Her lawyers argued she was a battered, clinically depressed wife who acted under diminished responsibility when her husband provoked her attack.

Prosecutors argued Robert Kissel's death in November 2003 was a carefully planned murder Nancy Kissel tried to conceal.

Prosecutor David Perry said Kissel struck at least five blows to her husband's head with a metal ornament while Robert Kissel lay face down in the bedroom, subdued by six drugs mixed in a milkshake.

She then covered the body with a plastic bag and towels, wrapped it in a carpet and had it moved to storage, Perry said.

Kissel testified her husband physically and sexually abused her as their marriage deteriorated. She denied murder but was willing to admit to manslaughter, a lesser charge that was never filed and the jury did not consider.

The 46-year-old from Adrian, Michigan, did not appear to react as the verdict was announced in court.

"We're not even going to tackle that now," said Kissel's mother, Jean McGlothlin, when asked whether an appeal would be filed.

She said the family's first priority was to make sure Nancy Kissel gets "medical, physical and psychological help from professionals, because she won't survive if she doesn't."

Kissel has appeared frail and withdrawn throughout the trial. When she took the stand last month, she told court she weighed just 38 kilos (84lbs), 16 kilos lighter than when she entered prison more than five years ago.

Her lawyer, Edward Fitzgerald, said there was clear evidence of her mental state deteriorating from 2000 to 2003.

Kissel's 2005 conviction was overturned last year on legal grounds.

Nancy Kissel testified Robert Kissel's behaviour changed after she had the first of the couple's three children in 1994, and he started forcing her to have oral and anal sex while becoming more emotionally distant and absorbed in his work.

"The more involved he got with the investment banking, the more forceful he was with me sexually," a frail and tearful Kissel testified.

Her lawyer, Edward Fitzgerald, asked the judge today to recommend compassion for her when a review board evaluates the life sentence. He cited Kissel's good character and that she suffered from an abusive relationship.

Robert Kissel worked for Merrill Lynch in Hong Kong. His estate was worth 18 million dollars (£12 million) in life insurance, stocks and properties, according to prosecutors.

The case spawned two books and a TV special.

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.