The District Attorney in the trial of Conrad Murray wrapped up the prosecution with damning testimony from an anesthesiology expert who found Michael Jackson had more sedatives in his system than Murray reported.

Dr. Steven Shafer testified Thursday that based on the timing of when Murray said he gave Jackson lorazepam, a sedative, the doses would only account for 10 percent of the amount of the drugs fund in Jackson’s bloodstream during the autopsy.

Murray is on trial for involuntary manslaughter in the 2009 death of 50-year-old pop singer. Autopsy results found Jackson overdosed on the anesthetic propofol combined with the effects of lorazepam.

The defense originally contended that Jackson swallowed the fatal dose of propofol by himself, but lawyers have since dropped the theory. They will continue to argue Jackson injected himself with more of the anesthetic.

The defense team is expected to begin presenting its case on Friday.