Michael Jackson feared he would not be able to perform a series of comeback shows, and begged for something stronger than sleeping pills two months before his death, a court heard on Monday.

The testimony came as lawyers for Michael Jackson’s doctor Conrad Murray launched a desperate counterattack, after four weeks of prosecution witnesses heavily implicating the medic in the King of Pop’s 2009 death.

“He spoke to me about this excitement and his fear about the tour,” said Allan Metzger, a medical doctor, referring to the planned series of 50 This is It concerts at London’s O2 Arena.

“His fear was that it was a big obligation,” said Dr Metzger, recalling how he had treated Michael Jackson for insomnia and other health woes for years when he was summoned to the singer’s LA mansion on April 18, 2009.

The defence has tried to portray Michael Jackson as a desperate drug addict who could have taken his own life by inadvertently giving himself an overdose of the anesthetic propofol on June 25, 2009.

Dr Metzger said the 50-year-old singer begged him to prescribe something he could take intravenously to help him sleep. “He used the word ‘juice’ .. I don’t think he mentioned the word of a specific sleep medication,” said Dr Metzger.

“He did not believe any oral medicine would be helpful,” he added, insisting he never gave him any intravenous drugs.

Dr Metzger was among the first witnesses to take the stand for Dr Murray’s defence, which faces an uphill task to get the medic off the hook after the prosecution rested its case on Monday.

The defence is expected to call some 15 witnesses in all, including medical experts, character witnesses and police, to rebut the charge against Dr Murray, but reports suggest the case could go to the jury by the end of the week.

Over the last four weeks prosecution witnesses have given a litany of evidence suggesting Dr Murray, 58, administered a deadly cocktail of drugs to help the King of Pop sleep, and abandoned him at the vital moment.

The Grenada-born medic, who has sat grim-faced throughout proceedings, faces four years in jail if found guilty by a seven-man, five-woman jury at the long-awaited trial.

The King of the Pop died of “acute propofol intoxication” after Dr Murray spent the night unsuccessfully trying to get him to sleep at the star’s rented mansion in the plush Holmby Hills district of Los Angeles.

The forensic toxicology report two years ago also noted the anti-anxiety drug lorazepam was in the singer’s system. Another defence theory is that a fatal cocktail was produced when Michael Jackson took some extra lorazepam.

After the defence launched its case on Monday the court also saw grainy black and white footage from security cameras outside the Jackson mansion, as an LA Police Department surveillance expert was questioned before lunch.

The footage showed a convoy of vehicles bringing Michael Jackson home at around 1 a.m. on the day of his death, after his latest rehearsal for the ill-fated This Is It series of concerts at London’s O2 Arena.

One of the highlights at the five-week trial, which started on September 27, was a recording of an interview Dr Murray gave police two days after the singer’s death.

In it the doctor recounted how he battled to help Michael Jackson to sleep, from around 1 a.m., with a series of IV infusions of sedatives before finally agreeing to give him 25mg of propofol at 10.40 a.m.

He said he left the room for two minutes to go to the bathroom, and returned to find Michael Jackson not breathing. A 911 call was placed at 12.20 p.m. Michael Jackson was eventually pronounced dead at the nearby UCLA Medical Centre, at 2.26 p.m.

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