The Englishman has joined Paolo Di Canio’s men for a fee believed to be in the region of £50,000.
The 21-year-old joined the Highlanders in 2009 but was keen to return to England having started his career with hometown club Leicester City.
Cox was out of contract in the summer and Terry Butcher has decided to cash in after adding Claude Gnakpa to his squad last week.
He was left out of the squad for Saturday's 0-0 home draw with St Mirren.
Source: FOOTYMAD
