By Laura Harding, Press Association Charles and Doris Clark AN elderly couple arrested on suspicion of the 1992 murder of their son will be the subject of a new documentary for ITV. Charles and Doris Clark were arrested in September last year after their son Steven Clark, 23, went missing in Saltburn, east Cleveland, in December 1992, when his parents said he failed to emerge from public toilets during a family walk. Cleveland Police searched their seaside home and garden in Marske but the couple were eventually released from the investigation without charge. The new film Accused Of Murdering Our Son – The Steven Clark Story follows the investigation over 17 weeks and will explore the pressure experienced by the couple as they faced the prospect of going to jail for the rest of their lives.