At a Sao Paulo press conference, the two spoke about Rowe's book, "What Really Happened to Michael Jackson, the King of Pop: The Evil Side of the Entertainment Industry".

Michael Jackson died in June last year from an overdose of prescription drugs, principally the anaesthetic propofol.

Ahead of a preliminary hearing to decide whether Murray will stand trial for involuntary manslaughter, Rowe's book asserts the doctor was paid to murder the pop icon.

The book also accuses concert promoter AEG Live of blackmailing Jackson.

Leonard Rowe, author, saying:

"The reason I felt compelled to write this book is because I know that what happened to him did not have to happen; Michael could have been saved. But people did not want him saved."

Joe Jackson, 81, told reporters he was helping promote the book for justice.

Joe Jackson, Michael Jackson's father, saying:

"I'm sure all the fans all over the world are looking for justice done, but we're not getting it. But we're going to get it because I'm trying to get federal investigation going."

He also told the crowded press conference that he didn't need the press to sell the book.

 Joe Jackson, Michael Jackson's father, saying:

"I'm not depending on the media to help us with this book; I'm depending on the fans. But not all media is bad media, there is good media too. The impact, as you said, will be a big impact, because if you tell it right just like we're telling it, there will be a lot of sales of this book all over the world."

The book goes on sale in stores around the world from December 1st.

Doug MacLaurin, Reuters.