Authorities raid Murray's clinic

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Los Angeles police and agents with the US Drug Enforcement Administration have gone through the clinic of Michael Jackson's private doctor, Conrad Murray.

Houston police stand outside the Armstrong Medical Clinic where Drug Enforcement Agents (DEA), Los Angeles police detectives and Houston uniformed officers carry out a search warrant against Conrad Murray, the doctor who was with pop icon Michael Jackson when he died, in Houston July 22, 2009. REUTERS/Richard Carson

They are seeking evidence of manslaughter in the death of the singer.

Agents left Murray's clinic with a computer hard drive and 21 documents for further investigation. After Jackson's death, investigators in his home found the powerful anesthetic, Propofol.

Officials are working to determine how the medication got there. Doctor Murray has emerged as a central figure in the probe. Police have spoken to him twice and say he's cooperating in their investigation.