Police are currently searching for missing 55-year-old Martyn from Skipton.
Martyn has been missing since this morning (Monday) and was last seen at his address in Newmarket Street area at around 5:30am.
Police have been unable to contact the 55-year-old and are growing concerned for his welfare.
Officers are asking for anyone who may have seen him, or who has information about his whereabouts, to contact them immediately.
He is described as having grey hair and is believed to walk hunched over with a noticeable stoop.
Martyn was last seen wearing a khaki green Parker jacket with orange lined hood, dark jeans, and black Adidas shoes.
A police spokesperson said:
"If you have seen Martyn or have any information that could help, including CCTV, dash-cam, or doorbell camera footage that may be relevant, please contact the police by calling 101 and asking for the Force Control Room.
"If you have an immediate sighting, please dial 999."
Please quote reference number 12240229152 when providing any information.

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