Los Angeles (CNN) -- Dr. Conrad Murray's defense team challenged the motives and methods of the prosecution's anesthesiology expert Friday, while the judge threatened to hold the defense propofol expert in contempt for comments he made about the prosecution. Dr. Steven Shafer, the last prosecution witness, will still be on the witness stand when the trial resumes Monday. Shafer testified Thursday that the "only scenario" to explain Michael Jackson's death was that he overdosed on propofol infused through an IV drip set up by Dr. Murray. Prosecutors argue that Murray's reckless use of the surgical anesthetic propofol to help Jackson sleep led to his death, while the defense contends Jackson self-administered the fatal dose, along with sedatives, without Murray knowing.
@highlight
NEW: Defense anesthesiology expert faces a contempt of court hearing
@highlight
NEW: Dr. Steven Shafer says Michael Jackson could have turned the fatal IV drip on himself
@highlight
NEW: If Jackson infused himself with propofol, Dr. Conrad Murray's still guilty, Shafer says
@highlight
Murray's involuntary manslaughter trial could to go the jury the end of next week
Conrad Murray
Murray
Murray
Murray
Conrad Murray
Murray
@placeholder appeared visibly shaken by Shafer's testimony Thursday, especially when he demonstrated his version of the IV drip.
Steven Shafer
Shafer
Steven Shafer
Shafer
Phone records and testimony showed that Murray was on the phone with one of his clinics, a patient, and then a girlfriend about the time that @placeholder calculated the oxygen in Jackson's lungs became depleted, causing his heart to stop beating.
Conrad Murray
Murray
Murray
Murray
Conrad Murray
Murray
Shafer demonstrated how he believed @placeholder set up the propofol infusion by hanging a 100-milliliter vial from a stand with tubing attached that would have led to a catheter port in Jackson's left leg.
Michael Jackson
Jackson
Jackson
Michael Jackson
Jackson
The defense contends that @placeholder swallowed eight lorazepam tablets, a claim based on testing of lorazepam levels in Jackson's stomach contents.