Lawyers defending Conrad Murray, Michael Jackson's doctor, have called their first witnesses.
They will have to counter four weeks of testimony from prosecution witnesses, who alleged that Dr Murray acted unethically and with gross negligence
Dr Murray is charged with involuntary manslaughter in a Los Angeles court.
Among the first witnesses were a doctor and a nurse practitioner, who had both previously treated or counselled Jackson.
http://www.bbc.co.uk/news/world-us-canada-15440281