Prosecutors rested their case against Michael Jackson's doctor on Monday after nearly four weeks of testimony and evidence against the man accused of involuntary manslaughter in the pop star's 2009 death.

The final witness to testify for prosecutors in the trial of Dr. Conrad Murray was Dr. Steven Shafer, who has been a key witness for prosecutors, telling the jury that Murray should never have given Jackson the powerful anesthetic propofol as a sleep aid at the singer's mansion.

Murray has admitted to giving Jackson propofol, the key drug that caused the Thriller singer's overdose, but defense attorneys have argued that Jackson gave himself an extra, fatal dose of the drug when Murray was absent.

Murray's attorneys are expected to call their first witness to the stand on Monday. They have told Los Angeles Superior Court Judge Michael Pastor they would like to finish presenting their case on Thursday.

Murray, who has pleaded not guilty to the charge of involuntary manslaughter, faces a maximum of four years in prison if convicted.