Los Angeles (CNN) -- AEG is not backing down from its charge that Michael Jackson's mother and her lawyers leaked e-mails to a reporter, in violation of a court order, despite a claim of responsibility by someone not connected to the Jackson's wrongful-death lawsuit against the concert promoter. The dramatic e-mails, published in the Los Angeles Times on Sunday, revealed the promoter for Jackson's "This Is It" concerts expressed doubts about the star's health and his ability to be ready for the shows for several months before his death. Howard Mann, who partnered with Katherine Jackson on a book about her family, acknowledged to CNN Wednesday that he gave the controversial documents to Times reporter Harriet Ryan.
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NEW: AEG's lawyer calls it "convenient" Howard Mann accepted responsibility for leak
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NEW: An insurance company wants to know why AEG didn't disclose the e-mails in its lawsuit
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Mann says none of the documents came from the Jacksons or their lawyers
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The Jacksons are suing AEG Live for wrongful death
The documents made public in the @placeholder story are not the most damaging to AEG that were uncovered, Boyle said.