The Prosecution: David Walgren

Deputy District Attorney David Walgren is a 16-year veteran of the Los Angles County District Attorney's Office.

He's assisted by 15-year veteran Deborah Brazil.

Walgren made the opening statements Tuesday in which he argued that Murray was not forthcoming with detectives and first responders about Jackson's propofol use. The prosecutor claimed that phone records show that Jackson was left unattended while under the drug and that 911 was not called right away when Jackson was first found unresponsive.

"It will be clear that Conrad Murray abandoned Michael when he needed help. It was Conrad Murray's gross negligence, it was Conrad Murray's unskilled hands and his desire to obtain this lucrative contract of $150,000 a month that led Dr. Murray to not only abandon his patient, but to abandon all principles of medical care," Walgren said.

Walgren also showed pictures of Jackson's bedroom to show how medical monitoring devices typically used when someone is under anesthesia were not there or appeared unused. A blood pressure cuff was still in a box and an oxygen tank had no oxygen, Walgren said.