Michael Jackson Death Investigation Complete

The LAPD investigation into Michael Jackson's death has been completed and the case will go to the D.A. within weeks, law enforcement sources tell TMZ ... and, we're told, it's all but certain Dr. Conrad Murray will be criminally charged in MJ's death.

Our sources say detectives completed their investigation late last month and the case will be formally presented to the Los Angeles County District Attorney as soon as scheduling allows. Turns out ... the presentation will draw quite the crowd. A number of members of the LAPD and the D.A.'s office will be present, and finding a date when everyone can show is a little tricky ... but we're told it will happen in a matter of weeks.

One very informed source says the LAPD investigation was "exhaustive" and "extremely thorough" and the D.A. has enough evidence to pull the trigger on a criminal case against Dr. Murray. That said, we're told the case is complicated, in part because Dr. Murray did not break any laws in administering Propofol to Jackson.

One law enforcement source connected with the case notes the D.A. has been actively working with the LAPD and it's all but certain the case will be filed. As for the charge -- a decision has not been made, but our sources say the likelihood is involuntary manslaughter, which requires a showing of gross negligence.