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.

Veteran comedian Jimmy Cricket to perform in Silsden
Skipton charity receives Easter egg donation to brighten children's holidays
North Yorkshire Police to roll out facial recognition technology
Doctors strikes will 'particularly impact Airedale A&E' bosses say
Northern trains expected to 'run normally' this Easter, passengers told
Changes to Craven bus services over Easter
Skipton Tree Top Climbing Centre opens for last ever season
Investigation begins following collision on Skipton High Street
Green Party announces election candidates for Ilkley and Addingham
Plans for second McDonalds in Keighley get go-ahead
Plans for 72 houses on edge of Silsden approved despite objections
Colour run to return to Skipton Academy Playing Field
Skipton MP meets with café owner to discuss community
North Yorkshire set to host Tour of Britain stages
Choir group donates hundreds of Easter eggs to Skipton good causes
The Boat House bar celebrates 10th anniversary
New Fish and Chip shop opens in Skipton
Skipton charity lunchers raise more than £500
Skipton MP shares concerns to Government on 'Tourist Tax'
Skipton children’s charity raises over £5,000 with support from Land Rover Experience


