The doctor charged in the death of Michael Jackson tried to change his story about his actions involving the pop star, telling his own experts in the upcoming trial a different story than he told police, prosecutors said.
Deputy District Attorneys David Walgren and Deborah Brazil filed a motion asking a judge to bar new claims made by Dr Conrad Murray.
They said he apparently made the new assertions in conversation with two doctors who will testify on his behalf in the case.
The accounts were revealed in letters from the experts, Dr Paul White, an anaesthesiologist, and Dr Joseph Haraszti, a psychiatrist and hospital director. Prosecutors believe Murray spoke to the experts after a preliminary hearing in January that focused on his statements to police after Jackson's death in June 2009.
The motion quoted Murray as telling the experts he left Jackson's bedroom to make a phone call, even though he initially said he left Jackson to go to the bathroom.
Experts also said Murray claimed to have experience using propofol - the powerful anaesthetic that killed Jackson - as a sedative, even though Murray did not make such a claim in police interviews.
J Michael Flanagan, a lawyer for Murray, said his client did not really change his story but instead explained some facts to Dr White.
Murray had forgotten some details when he spoke to police, Mr Flanagan explained, adding his client had decided to make some phone calls after going to the bathroom. In addition, the time sequence of events was slightly different when Murray thought about it later, Mr Flanagan said.
Murray has pleaded not guilty to involuntary manslaughter. A coroner found that Jackson died of an overdose of propofol and other sedatives.