Prosecutors are debating whether to charge Michael Jackson's personal physician, Dr. Conrad Murray, with involuntary manslaughter or a more serious charge, a law enforcement source told FoxNews.com on Friday.

Whatever the charge, Murray will be prosecuted on a theory of gross negligence, the source said.

The agencies involved are looking for a suitable date to present their case to the Los Angeles district attorney, the source said.

The DA's office told Fox News it could not comment on the report because it hasn't received the case yet.

The Los Angeles Police Department has not released an official statement.

Murray's spokeswoman in Houston, Miranda Sevcik, and his lawyer, Edward Chernoff, said the doctor had no comment and reiterated he neither prescribed nor administered anything that should have killed Jackson.

SLIDESHOW: Scenes from the life and sudden death of Michael Jackson.

According to a report from TMZ, the LAPD concluded on Friday its investigation into the 50-year-old singer's death on June 25, and the case will go to the district attorney's office within weeks.

Jackson died at his Los Angeles home while under Murray's care as the singer prepared for an ambitious concert schedule.

The Associated Press contributed to this report.