Murder charges are expected to be laid after a body - believed to be that of missing Launceston man Billy Ray Waters - was discovered in bushland near Mayfield.
Three people from Launceston are in custody, including two 17-year-old males who have undergone police questioning.
A 33-year-old man is being questioned this afternoon.
The body was found covered by branches and leaves about 500 metres from the Mowbray Golf Club, after a combination of reports via Crime Stoppers and work by investigative teams.
While still yet to officially confirm the identity, police are extending condolences to the family of the 19-year-old.
Billy hadn't been seen since August 4th.
A number of details of the case are yet to be revealed by police, as the investigation is still active.