LOS ANGELES- Prosecutors may file involuntary manslaughter charges as early as Wednesday against Michael Jackson's deathbed doctor for his role in the King of Pop's death, US media reported.

Conrad Murray's lawyer said his client, who has been placed at the center of the singer's death on June 25, was in Los Angeles and ready to surrender to authorities if they file criminal charges.

"I don't have any specific information that leads me to believe he is going to be charged this week," attorney Ed Chernoff told the Los Angeles Times. "But if he is, we've made it clear he's available to turn himself in."

The Houston, Texas-based personal physician and his lead attorney's presence in Los Angeles unleashed a flurry of speculation that authorities could file charges soon.

But the Los Angeles Country district attorney's office would not confirm whether prosecutors were preparing to file charges against Murray.

Chernoff told the Times that Murray was visiting Los Angeles for personal matters and for talks with his criminal defense team. The doctor has an infant son who lives in Santa Monica, California.

Murray, 56, has acknowledged that he administered the powerful anesthetic propofol only after trying many other medications to help Jackson sleep, and after the singer's "repeated demands/requests" for the drug.

Jackson then went into cardiac arrest within 20 minutes of that injection, while Murray had stepped out for a bathroom break, the doctor told authorities in an interview a few days after the death. The star died on June 25, aged 50.

By Murray's own account to police, he did not call for help until 12:22 pm, more than an hour after he realized Jackson wasn't breathing.