Karla Homolka is back in Canada.

The notorious former wife and accomplice of sex predator Paul Bernardo had previously been living in Guadeloupe, where she was raising her children. However, two years ago, a journalist discovered her whereabouts in the Caribbean islands.

Ms. Homolka is now back in Quebec, her sister revealed in testimony at Luka Rocco Magnotta's murder trial in Montreal on Friday.

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The sister, who used to be known as Lori Homolka, has since changed her name to Logan Valentini, the trial heard.

Ms. Valentini appeared as a witness because Mr. Magnotta, who killed and dismembered Chinese student Jun Lin, is alleged to have mailed body parts to Vancouver's False Creek Elementary School in a package labelled with Ms. Valentini's name and return address.

Hubert Chrétien, son of former prime minister Jean Chrétien, also testified because his name and return address appeared on another package of Mr Lin's remains sent to a different school in Vancouver.

Testifying by video link, Ms. Valentini said she was stunned when called by police in 2012 and she testified she could not understand why she was again being dragged into something that did not involve her.

As the Crown questioned her to establish her identity, Ms. Valentini said that she is a cashier at Zehrs and Ms. Homolka is her sister.

She said Ms. Homolka is living in Quebec and is married to Thierry Bordelais, the brother of Ms. Homolka's lawyer.

Ms. Valentini added that she met her sister recently.

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Ms. Homolka initially lived in Quebec after her 2005 release from a 12-year sentence for her role in the lurid sex killings of two Ontario schoolgirls, Kristen French and Leslie Mahaffy, and the drug-induced death of her sister Tammy.

She is believed to have left for the Caribbean in 2007 after reporters twice retraced her while she was living in Montreal. Two years ago, journalist Paula Todd wrote that she had found Ms. Homolka in a remote Guadeloupe area, where she lived with Mr. Bordelais and their three small children, a girl and two boys.

Ms. Valentini said it is commonly known that she is the sister of Ms. Homolka. She said she legally changed her name in 1996.

Mr. Magnotta, 32, has admitted the physical acts of which he is accused but has pleaded not guilty by way of mental disorder.

He faces four other charges: criminally harassing Prime Minister Stephen Harper and other members of Parliament; mailing obscene and indecent material; committing an indignity to a body; and publishing obscene materials.