Testimony draws to a close in Michael Jackson doctor trial

(CBS/AP) LOS ANGELES - Testimony came to a close Tuesday in the involuntary manslaughter trial of Michael Jackson's personal physician, Dr. Conrad Murray.

Pictures: Who's who in the trial of Dr. Conrad Murray
Pictures: Michael Jackson's Doctor Trial
Video: Dr. Conrad Murray manslaughter trial begins

Closing arguments in the six-week case will begin Thursday - one of the final steps before jurors begin deliberations.

Defense attorneys rested their case today after calling 16 witnesses. A total of 49 witnesses testified over 22 days of trial.

Prosecutors contend Murray gave Jackson a fatal dose of the anesthetic propofol in the bedroom of the singer's mansion. Defense attorneys claim Jackson self-administered the dose when Murray left the room. Murray has pleaded not guilty to involuntary manslaughter in Jackson's death on June 25, 2009. He could face up to four years behind bars and the loss of his medical license if convicted.

Murray told Superior Court Judge Michael Pastor on Tuesday that he would not testify in his own defense.

Murray's decision against testifying came after hours of intense grilling by a prosecutor of Dr. Paul White, an anesthesia expert who has said he believes Jackson injected himself with the fatal dose of propofol when Murray left his bedside.

After asking only eight questions on Monday, Deputy District Attorney David Walgren got  White to acknowledge that Murray had repeatedly violated the physician's standard of care.

Throughout the day, White also told jurors that he would have never done what Murray was doing - giving Jackson propofol as a sleep aid.

The last witness was prosecution propofol expert, Dr. Steven Shafer, who was called by prosecutors as a rebuttal witness to address a few points raised by previous testimony.

Complete coverage of the Conrad Murray - Michael Jackson case on CBS News