DETROIT -

A former comics shop owner convicted twice of the murder of his wife in 1990 has been denied an appeal.

Michael George had argued that there was weak evidence and improper tactics at trial.

READ: Court of Appeals ruling

George has maintained his innocence in Barbara George's shooting death at their Clinton Township shop, Comics World.

He was convicted in 2008, but won a second trial after a judge found errors by prosecutors and potential new evidence emerged. He was found guilty again in October.

George could still appeal to the Michigan Supreme Court.