London, Jan 7 : Self-styled investigative journalist Ian Halperin is so set on finding out if Michael Jackson is dying from a lung disease that he has offered to pay for the singer to undergo medical tests.

Halperin, who is producing a new book on Jackson's life, insists that the Thriller star is suffering from the deadly lung condition Alpha-1 antitrypsin deficiency.

When Jackson''s publicist denied the claims of his illness last month by calling them "a total fabrication", the author offered to fund for a medical examination to get to the truth.