Police officers searching for their missing colleague Tim Frohwein have issued CCTV footage and a still CCTV image of him.
The image shows Tim walking down Macclesfield Old Road in Buxton at about 1.30pm on Sunday November 17 just after he left home.
They have also issued a picture of a green Mountain Essentials walking pole like the one he was carrying.
Assistant Chief Constable Dee Collins said: “We are also trying to trace some people who were in the Goyt Valley at the same time as Tim.
“We’d specifically like to talk to a man and woman, who were dressed in light running gear, who were seen on Berry Clough heading towards Derbyshire Bridge.
“We also know that other people, including the driver of a 4x4 Mitsubishi Delica and three off-road cyclists, were also in that area at around 2pm.”
Mr Frohwein, who is six foot three inches tall, was wearing a three quarter length dark coat, pale blue shirt and brown jeans. He may be carrying a walking pole. He has short dark hair and wears glasses.
Mr Frohwein, who is Chief Inspector for Chesterfield and the Amber Valley, is a keen cricketer and has been involved with Buxton Cricket Club for many years.
Buxton CC chairman Tim Budd said: “Along with many others, we are desperately concerned for Tim’s welfare and sincerely hope that he will be found soon.
“Tim is a hugely liked and respected player within the club and the local cricketing community.
“He is also known more widely as a result of his work as a junior coach and his efforts in support of the club’s development plan over the last ten years.
“Our thoughts are with Lesley, Sam, Chris and Joel.”
Anyone with any information should call police on 101.
An independent volunteer search for Tim is taking place tomorrow (Saturday) to supplement the efforts of police and mountain rescue teams.
Anyone who wants to take part should meet at Derbyshire Bridge car park in the Goyt Valley at 9.30am when there will be an organisational brief followed by a 9.45am start.
This search is not being co-ordinated by police but is intended to supplement their search by covering a different area.
Searchers will go out in pairs or groups of threes, and anyone attending should take suitable footwear, a packed lunch, OS maps of the area and if possible walkie talkies.