http://insession.blogs.cnn.com/2011/11/30/prosecutor-murrays-girlfriend-difficult-to-believe/
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In Session’s Christi Paul and Beth Karas discussed the Dr. Conrad Murray case with prosecutors David Walgren and Debra Brazil in one of the attorneys' first interviews after Murray’s sentencing Tuesday.
During the interview, Paul played a now infamous clip of Murray’s girlfriend, Nicole Alvarez, testifying that her profession as an actor requires her to take care of her “instrument,” meaning - as she said - her “self.”
Brazil said at first she thought Alvarez said she played a musical instrument, and that’s why she asked for clarification. Brazil said Alvarez’s testimony was difficult to believe, and showed that she was interested in the same lifestyle Murray was trying obtain by working for Michael Jackson as his doctor.
Both Walgren and Brazil said they agreed with Los Angeles County Superior Court Judge Michael Pastor's decision to sentenced Murray to the maximum of four years in jail.

Karas asked Walgren about his reaction to Pastor’s 20-minute “verbal assault” of Murray during the sentencing. Walgren said he wouldn’t characterize it as a verbal assault, but thought the judge was just expressing his feelings about Murray, because he thinks it seemed reasonable to be offended by Murray’s actions.
As for why the prosecution chose to charge Murray with involuntary manslaughter instead of the more serious charge of second-degree murder? Walgren said second-degree murder was considered, but ultimately involuntary manslaughter was chosen as the most appropriate charge in this case.