A rep for the late Michael Jackson's personal physician, Dr. Conrad Murray, says the doctor would prefer to grieve in private.

"He will be mourning in private because he feels his presence would remind people of Michael Jackson's death, and the doctor would prefer that people remember his friend as he was in life," Murray's spokesperson says.

As for when Murray might comment on the medical attention he gave Jackson, the doctor is "completely off the radar until the toxicology results are revealed," his rep says, adding, "He's not even talking to friends and family, and I haven't even spoken to him personally, either."

The rep also says Murray thinks the concert promoter behind Jackson's canceled 50-date London engagement owes him $300,000 for his services to Jackson since May 1. An attorney representing Conrad tells ET the doctor has "fully cooperated" with authorities investigating Jackson's death.