The man who called the 911 emergency service at Michael Jackson's house the day he died told police the stars physician Dr Conrad Murray hid bottles of propofol from family members and authorities.
The very potent drug, also known as diprivan, is administered intravenously as a general anaesthetic used to sedate patients for surgery and is only available to medical personnel.
The witness- bodyguard Alberto Alvarez- told police he saw Dr Murray running around, hiding propofol bottles in a closet near the room where the doctor administered the drug to Jackson.
Authorities found bottles of the anaesthetic in what looks like a secret compartment area of the closet.
A source close to Dr Murray told US celebrity news website TMZ that Alvarez made the statement two months after Jackson's death in the office of his lawyer, Carl Douglas when Alvarez was questioned again by police. Douglas is also a lawyer for the Jackson family.
The source says Alvarez' statement contradicts what he told the authorities the day of Jackson's death. The source says Alvarez never told police at the scene about hiding propofol.
The source notes and TMZ have confirmed that Dr Murray told police two days after Jackson's death where the Propofol bottles could be found.
One of the bottles of propofol in the closet was apparently empty with a large tear in the rubber stopper. Law enforcement sources believe Dr Murray may have connected the large bottle of propofol directly into the IV bag and a massive amount of the drug, they believe entered Jackson's system and killed him.
Alvarez told police during the interview in Douglas' office that he saw a milky white substance in an IV bag. However, the IV bag in the room reportedly contained no traces of propofol.
Murray was charged with involuntary manslaughter by prosecutors in Los Angeles last month. He denied the charge and pleaded not guilty.