Sources tell the L.A. County District Attorney’s Office has a criminal complaint drafted and ready to file against Dr. Conrad Murray in the death of Michael Jackson.

We’re told it’s now just a matter of timing before Dr. Murray is charged with involuntary manslaughter — a felony that carries a maximum 4-year prison sentence.

As we first reported, Dr. Murray plans on surrendering today, so all signs point to the D.A. filing criminal charges as early as this morning.

Dr. Murray is in Los Angeles and his legal team is already mapping out strategy.