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A memoir apparently written by a Canadian serial killer has been withdrawn within hours of appearing for sale online, the BC reorts.

Former multi-millionaire pig farmer Robert Pickton was convicted in 2007 of murdering six women. Charges relating to 20 other deaths were suspended.

Another inmate helped him smuggle the book out of prison, CTV reported.

The publisher requested its removal from retailer Amazon and apologised to victims’ families, reports said.

Officials in British Columbia had earlier vowed to prevent Pickton, who says he is innocent, from profiting from sales of the memoir, entitled Pickton: In His Own Words.

“It is not right that a person who caused so much harm and hurt so many people could profit from his behaviour,” said the province’s Minister for Public Safety, Mike Morris, in a statement.

British Columbian officials also asked Amazon to stop selling the memoir, which was published by Colorado-based Outskirts Press, a firm that specialises in helping authors self-publish books.

Amazon users had also called for it to be removed and gave it the lowest possible rating. The company has not yet commented on the book’s appearance on its site.