Floral tributes have been left in woodland close to where Mr Nicol’s body was found.
Detectives believe Mr Nicol drove to the street, near Wiliamston Primary School, in his black Ford Mondeo with the registration plate GN02 GRN at about midnight.
Officers have appealed for anyone who saw Mr Nicol or his vehicle in the area, external at that time to come forward.
Det Ch Insp Jonathan Pleasance said: “Our thoughts are with Mr Nicol’s family and friends at this very difficult time,” he said.
“It is vital that we get answers for them and we are fully committed to tracing the person responsible as soon as possible.
“This is a challenging investigation and any piece of information, no matter how small or insignificant you think it is, could prove vital so please do pass it on.”
