Police are appealing for anyone who might have seen Mr Nicol to contact them.
Supt. David Byrne speaks to ITV News about the investigation.
More top news
Durham Police have issued an urgent missing persons appeal for an 86-year-old man with dementia and poor mobility.
Police have released a CCTV image of a potential witness they would like to speak to after a woman died at a Tesco store in Middlesbrough.
The Discovery School in Newcastle announced earlier this month it was to close ahead of another damning report from the education watchdog.