London, Feb 23 (IANS) Late singer Michael Jackson's estate has once again been slapped with a lawsuit by a US law firm over outstanding dues.

The firm bosses at the organisation, which has not been named, allege the late King of Pop died owing them a sum of $628,718, reports femalefirst.co.uk

The creditors' claims against the 'Thriller' hitmaker's estate have now exceeded $23 million.

They include legal challenges from Jackson's former accountant Diane Williams, his spiritual adviser Reverend June Juliet Gatlin, his former skin doctor Arnold Klein, choreographer LaVelle Smith Jr. and the pop superstar's one-time manager and adviser Dr. Tohme Tohme.