The mother of British teenager Scarlette Keeling, who was murdered on a beach in Goa [Images], spent a year in jail for slitting the throat of a man she met at a party, her son has revealed.

Hal Keeling, 19, was quoted as saying by the Daily Mail of Britain that Fiona MacKeown, 43, was jailed for attempted manslaughter.

MacKeown's son revealed that his mother was 18 when she and a friend were charged with attempted murder. She served a year of a three-year sentence after the charge was reduced to attempted manslaughter following a trial in 1983, the daily reported.

"I haven't been an angel in the past," the mother, who is in Goa following her daughter's murder, confessed to her nine children, according to Hal.

"She said she was very naive and a man they met at a party tried to get his heels into her. Mum said he was into black magic and she freaked out," Hal was quoted as saying in the report.

The 15-year-old Scarlette's semi-clad body was found on Goa's Anjuna beach on the morning of February 18.

The police have nabbed two accused in connection with the case, who reportedly have confessed to the crime. While one of them, Samson D'Souza, has admitted to sexually abusing Scarlette after drugging her and later dumping the teenager in the shallow water, another Placido Carvalho drugged her.

MacKeown from Bideford, Devon, said she was not satisfied with the investigation in the case, terming it "an extension of original cover-up by the police".