Michael Jackson's children cried as they watched Dr. Conrad Murray attempt to revive the king of pop's lifeless body in the bedroom of Jackson's rented mansion, the head of Jackson's security team testified?on September 28, 2011?at Murray's manslaughter trial.

Faheem Muhammad described to jurors the chain of events on the day Jackson died from a drug overdose, June 25, 2009.

Muhammad said that when he reached the Jackson home, he found a sweaty Murray in Jackson's bedroom hovering over Jackson, who was lying on the floor.

"He appeared to be administering CPR. He appeared very nervous," Muhammad said.

Jackson's "eyes were open and his mouth was slightly open," Muhammad said, adding that he appeared to be dead.

The security guard and driver said Jackson appeared dead. Muhammad asked if 911 had been called and was told that they were on their way.

"Immediately, I was shocked just seeing him. Shortly after that, I realized that his children were standing outside of his room … the two older ones," Muhammad said.

"Paris was on the ground balled up crying and Prince ... was standing there … and he just had a real shocked, just slowly crying type of look on his face," he said.

Muhammad said he grabbed the children and called for their nanny and moved them to a place where they couldn't see Jackson.

Murray showed little emotion in the courtroom as Muhammad recounted the frantic effort to save Jackson's life. Murray could face four years in prison if convicted of involuntary manslaughter in the overdosing death of Jackson.

Muhammad's testimony followed that of Jackson's personal assistant, Michael Amir Williams. Williams told jurors that soon after Jackson's death, Murray requested to return to the Jackson home because "there's some cream in Michael's room in the house that he wouldn't want the world to know about."

Propofol, the powerful anesthetic found in Jackson's system at the time of his death, has a white, creamy appearance and is called "milk" by addicts.

Conrad Murray's manslaughter trial is based on the prosecutions assertions that Murray "repeatedly acted with gross negligence" and that "his unskilled acts led to Michael Jackson's death on June 25, 2009." On August 28, 2009, the Los Angeles County Coroner ruled Jackson's death a homicide. In February 2010, Murray pleaded not guilty to charges of involuntary manslaughter. Michael Jackson Trial: Will Kids Take the Stand? Watch Video

Williams was the first to receive a call from a panicked Murray at 12:13 p.m. In his hurried message, Williams said, Murray screamed, "Call me right away. ... Please call me right away."

Murray told Williams that Jackson had suffered a "bad reaction." Unable to get to the Jackson home quickly, Williams asked Jackson's driver and head of security, Muhammad, to check on Jackson.

Murray never told Williams to call 911, a sign of negligence and abandonment, prosecutors contend.

Both Williams and Muhammad recounted locking Murray out of the Jackson home by telling him a lie that police had taken their keys from them.