A woman died of shock caused by blood loss as a result of being bitten by her daughter's dogs, a post-mortem examination has revealed.
71 year old Gloria Knowles was found dead at a house in Morden on Tuesday evening.
Five dogs were seized and police cordoned off two adjoining houses.
No arrests have been made in connection with the attack.
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The painting, entitled 'Beautiful Beautiful George Michael Love Painting', was auctioned to help raise funds for HIV and Aids prevention.
The 38-year-old victim was standing on a busy Victoria Line train when another passenger approached him.
The boy, called Roman, told police call handler his mum "is dead" and "she's closing her eyes and not breathing".