LOS ANGELES (CBS) — After two days off this week, jurors in the trial of Michael Jackson’s personal physician, Conrad Murray, are back in court.

Jurors have been listening to testimony from the prosecution’s final witness, anesthesiology expert Dr. Steven Shafer.

Shafer, who wrote the guidelines and warnings included with every bottle of propofol, began his testimony Thursday and was expected to return to court Monday, but the trial was postponed because of his father’s death.

Shafer is the final witness for the prosecution.

A court session for Tuesday was also called off to give the defense time to consult with experts about a new study commissioned by the prosecution.

The study involved the amount of lorazepam found in Jackson’s system at the time of his death in June 2009.