By Daniel Miller PUBLISHED: 07:47 EST, 2 October 2012 | UPDATED: 08:00 EST, 2 October 2012 Multiple personalities: Diana Williamson claims she is not responsible for defrauding Medicaid for $300,000 A once-respected doctor has blamed a 'mischievous' alternate personality for defrauding Medicaid of $300,000 by writing prescriptions for painkiller pills which were later sold on the street. Diana Williamson, 56, who founded an Aids institute and ran educational programmes in prisons, pleaded guilty to the crimes but said they were carried out by one of her many personalities. Urging the court  to show  leniency, her defense lawyer Jonathan Marks said Williamson's crimes were really committed by a personality called Nala, who is 'mischievous, irresponsible, reckless and, as we have just discovered, criminal.'
@highlight
Diana Williamson, 56, wrote prescriptions for painkillers which were later sold on the street
@highlight
But she told judge her mischievous alternate personality 'Nala' was to blame
Nala, saying she 'committed these crimes without telling @placeholder or the