BONN, June 24 (Reuters) - A German regional court ruled on Monday that a prominent banker who was accused of playing a role in an alleged 10 billion euro ($10.7 billion) tax fraud scheme was no longer fit to stand trial for health reasons.

Earlier this month, both prosecutors and defense lawyers requested the termination of the criminal trial of the banker, Christian Olearius, who is now 82 years old.

The move by the Bonn court on Monday granted that request.

Olearius, the former CEO and chair of Hamburg-based bank M.M. Warburg, has always maintained that he did nothing wrong.

In the scheme, known as "cum-ex" or dividend stripping, banks and investors would swiftly trade shares of companies around their dividend payout day, blurring stock ownership and allowing multiple parties to falsely reclaim tax rebates.

Prosecutors had originally identified damages of nearly 280 million euros, while Olearius' defense sought acquittal. ($1 = 0.9321 euros) (Reporting by Matthias Inverardi; writing by Tom Sims; editing by Matthias Williams)