THE MICHAEL JACKSON DEATH TRIAL - DAY ONE: Dr. Conrad Murray's involuntary manslaughter trial began yesterday in L.A. The prosecution contends that Murray administered a fatal dose of the powerful anesthetic Propofol to Michael Jackson on June 25th, 2009, while the defense says the pop star caused his own death.

LISTEN: Dr. Conrad Murray's lawyer says Michael Jackson killed himself ...

Prosecutor David Walgren played a recording that Murray made of Jackson from May 10th, 2009 showing the singer "highly under the influences of unknown agents," as he talked about his planned comeback concert. Prosecutors say the recording is evidence that Murray knew about Jackson's health problems weeks before his death.

LISTEN: Voice recording Dr. Conrad Murray made of an incoherent Michael Jackson under the influence of "unknown agents" ...

Yesterday's highlights also included:

--The prosecution also showed the jury a photo of Jackson dead on a gurney.

--Defense attorney Ed Chernoff said Jackson's death was "tragic, but the evidence will not show that Dr. Murray did it."

--Chernoff said scientific evidence will show that, on the morning Jackson died, he swallowed a sedative without his doctor's knowledge, "enough to put six of you to sleep and he did this when Dr. Murray was not around."

If convicted of involuntary manslaughter, Murray faces four years in prison and the loss off his medical license.