05:51 EDT, 10 December 2020 An elderly couple arrested for the 1992 murder of their disabled son has been 'released under investigation'. Doris, 81, and Charles Clark, 78, both former police officers, are suspects in the disappearance of 23-year-old Steven. Mr Clark vanished after going into public toilets in Saltburn, North Yorkshire, on December 28, 1992, while out walking with his parents. His disappearance remained a mystery for decades until Cleveland Police reopened the cold case and launched a murder probe. The force yesterday confirmed two people had been arrested and bailed until a date in December. Doris, 81, and Charles, 78, both former police officers, are suspects in the disappearance of 23-year-old Steven Clark