(Cover) - EN Showbiz - Dr. Conrad Murray acted with "gross negligence," a court heard yesterday.

The trial into the death of Michael Jackson heard from pulmonologist and sleep medicine specialist, Dr. Nadar Kamangar, who said the King of Pop's physician did not carry out due care.

The critical care doctor said that although insomnia is a common condition, its treatment should be handled carefully.

Kamanger told the court that Propofol should be administered with an automated pump and the effect of the drug needed to be monitored carefully as the effects of it could be unpredictable, especially when mixed with other sedatives.

The Thriller star died on June 25 2009 from acute Propofol intoxication. His former physician, Dr. Murray, has been charged with involuntary manslaughter but denies the allegations.

Murray changed his defence yesterday and backtracked from earlier claims that Jackson swallowed Propofol while he was out of the room on a bathroom break.

His defence may now claim that the singer injected the powerful anesthetic into his own body when Murray was not present.

Kamanager added in his testimony that Murray's failure to call 911 immediately was an "unconscionable deviation of care" and his choice to ignore Jackson's "clear signs" of drug abuse were completely unethical.

Murray faces four years in prison and the loss of his medical licence if he is convicted. The prosecution is expected to wrap up its case today. (C) Cover Media