OPP and the Ministry of Labour are investigating the death of Thunder Bay Police Constable Joseph Prevett. Police Chief JP Levesque says Prevett was participating in a K-9 training exercise in Gravenhurst. He was in the middle of a searching exercise with his dog Timber on Wednesday morning when he collapsed. He was rushed to hospital in medical distress. He died a short time later. Prevett was 50 years old and started his policing career in 1998.