 In his written confession, Corder admitted that he and Marten had argued on the day of the murder over the possibility of the burial site being discovered.In 1967, Donald McCormick wrote "The Red Barn Mystery", which brought out a connection between Corder and forger and serial killer Thomas Griffiths Wainewright when the former was in London.According to McCormick, Caroline Palmer, an actress who was appearing frequently in a melodrama based on the Red Barn case and had been researching the murder, concluded that Corder may have not killed Maria, but that a local gypsy woman might have been the killer.