Michael Jackson claimed he had been given injections at 13 to delay puberty and keep his voice high.

Jackson's former physician, (inset) Conrad Murray and Michael Jackson

The Thriller hitmaker's former personal physician, Conrad Murray — who was jailed for involuntary manslaughter after administering the fatal dose of Propofol, which killed the King of Pop in June 2009 — claimed he confided in him about the hormone treatment he had received in his early teens.