The elderly couple arrested on suspicion of murdering their son are working with a former detective on a TV documentary about the case.
Charles and Doris Clark are helping Mark Williams-Thomas while under investigation in connection with the death of their son Steven.
The 23-year-old mysteriously vanished on December 28, 1992, after going into a public toilet in Saltburn, North Yorks, while his mum was in the ladies.
Doris, 82, was spotted filming last month close to the spot where Steven went missing. Both she and husband Charles, 78, were due to answer bail on Sunday but were released under investigation by Cleveland Police after their arrest in September.
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