Michael Jackson was emaciated, bald and riddled with needle wounds when he died, a leaked autopsy reportedly reveals.

A post mortem examination done on Jackson following his death last week found the 1.78-metre tall pop superstar weighed just 51 kilograms, Britain's newspaper reported.

The 50-year-old's stomach was reportedly empty except for some partially-dissolved pills and his hips, thighs and shoulders were pockmarked with needle wounds - believed to be the legacy of injected narcotic painkillers.

Jackson was also almost completely bald, with just a covering of "peach fuzz" left on his scalp, the pathologist noted in the alleged report. He died wearing a wig.

The report stated Jackson several broken ribs caused by rescuers pumping his chest to try to resuscitate him after he went into cardiac arrest.