Missing since August 25, 2015.
Extensive land and water searches have failed to locate the missing 57-year-old, who was last seen at the village of Glen Vowell on August 25, 2015.
Sampson is described as being of First Nations descent and about 183cm tall. He weighs about 77kg, has dark brown and grey hair and brown eyes. He was last seen wearing grey sweatpants and a grey or blue shirt.