Michael Jackson’s family has voiced anger over the choice of charge laid over the singer’s death.
Jackson’s doctor Conrad Murray has pleaded not guilty to a charge of involuntary manslaughter.
Officials have ruled the singer died from an overdose of a powerful anesthetic and other drugs.
Fans and members of Jackson’s family are demanding to know why more serious charges were not laid.
Michael Jackson’s father said: “I was not happy. I need some fans behind me with all of this because this was not justice … because my son was murdered.”
Doctor Murray also faced angry protesters outside the courthouse in Los Angeles. He faces up to four years in prison if convicted.
Legal analyst Stan Goldman said: “Had they chosen to charge him with murder, I think the defence would have had some very strong arguments that the behaviour of their client did not rise to that level.”
Doctor Murray was hired in May 2009 to care for Jackson as he prepared for a series of comeback concerts.