Michael Jackson's personal physician Dr. Conrad Murray was not qualified to administer the powerful anaesthetic which killed the pop superstar, a Los Angeles court has heard.

Expert cardiologist Dr. Daniel Wohlgelernter took the stand on Tuesday (07May13) to testify on behalf of Jackson's mother, Katherine, in her wrongful death trial against bosses at Aeg Live, the promoters behind her son's doomed This Is It comeback gigs.

Wohlgelernter was the first medical expert called as a witness in a bid to discredit the jailed doctor, who is currently serving time for involuntary manslaughter after administering the fatal dose of Propofol that resulted in Jackson's 2009 death.

The cardiologist told the court that only anaesthesiologists should administer Propofol and Murray did not have the proper qualifications to do so. He also highlighted Murray's lack of expertise in the fields of drug addiction and insomnia, both of which require specialised training.

Katherine Jackson and her legal team are hoping to land billions of dollars from Aeg Live executives, claiming they were negligent in ignoring her son's life-threatening health issues and blaming them for hiring Murray to treat the tragic singer.

Aeg executives have denied all wrongdoing and insist the singer hired Murray.

Jurors were also given full details of Jackson's autopsy report in court on Tuesday as officials confirmed the King of Pop suffered from a skin condition which whitened his skin and that he had his hairline and eyebrows tattooed on. He weighed just under 136 pounds (61.6 kilograms) at the time of his death.