EXCLUSIVE: Witnesses Not Interviewed Because Only 3 LAPD Detectives Assigned to Jackson Case, Says Source

One reason why Los Angeles police have yet to interview Michael Jackson's security guard and chief of staff is because only three detectives are assigned to the case, a source close to the situation tells RadarOnline.com.

"There are only three detectives from LAPD's Robbery Homicide Division assigned to the case," the source said. "This is one of the reasons the investigation is still ongoing at this point."

Alberto Alvarez, who made the 911 call the day Michael died, has not been interviewed by police. Alvarez, a security officer, could be crucial to establishing the time line of events as police focus on Dr. Conrad Murray.

Murray administered various drugs and propofol to Jackson, who stopped breathing when the doctor left the room. Officials say Jackson died from a propofol overdose.

Michael Amir, described as the King of Pop's chief of staff, also has not been interviewed by police.

Alvarez and Amir are both represented by attorney Carl Douglas, who told the Los Angeles Times: "We arranged two separate occasions for LAPD investigators to meet with my clients. My clients came early wearing suits and ties. The first meeting was canceled and rescheduled. The second meeting I had to call them to inquire about the detectives' absence."

Establishing a solid timeline of events is crucial if police are going to make a case against Murray, whose attorneys are already disputing the authorities' version of when events happened.

Douglas did not return calls for comment.