Witness Claims Dr. Murray Caused Jackson's Death

On Wednesday, medical expert Dr. Steven Shafer, presumably the prosecution's last witness, testified that Conrad Murray violated the standard of care while working with propofol led to Michael Jackson's death, according to the Associated Press.

Shafer told jurors that Murray's lack of proper medical equipment, notes and medical records, along with a disintegration of the patient-doctor relationship, were factors in his death.

MORE: Expert Testimony Accuses Murray of Fatal Misstep

"Saying yes is not what doctors do," Shafer said. "A competent doctor would know you do not do this."

He went on to give jurors a quick course on propofol, which included a video showing the safety measures that he believes Murray failed to utilize. Shafer also said that a doctor can't multitask and properly monitor a sedated patient, referring to the fact that Murray was reportedly on his cell phone in the hours prior to Jackson's death.

Shafer, who's also a Columbia University professor, said that he testified for the prosecution without a fee because of the public's waning confidence regarding propofol, which he called wonderful drug when properly administered. He demonstrated the measure of difficulty in using propofol, which controverts the defense's previous claim that Jackson had self-administered the drug.

MORE: Coroner: No Evidence Jackson Gave Self Propofol

He also added that failing to follow standard methods of notating Jackson's treatment, absence of a written consent form and failure to immediately call for help when problems arose was, in his opinion, an unconscionable violation of Jackson's rights.

The defense will begin calling witnesses on Friday, including police detectives and Randy Phillips, the head of AEG Live. Murray has pleaded not guilty to involuntary manslaughter. If convicted, he could face up to four years in prison. Check back with ET for continuous coverage of the Michael Jackson death trial.