The severed head of Fribjon Bjornson was found in a vacant house on the Nak'azdli reserve near Fort St. James on Feb. 3, 2012, three weeks after he was last seen about 60 kilometres away at a 7-Eleven in Vanderhoof, B.C.
Bjornson was 28 years old and a father of two. The rest of his body was never found.
Bjornson's father, Fred, told CBC News he got a call from authorities this weekend telling him four people are in custody.
I'm "relieved to know that they'll finally be off the street," he said.
Fred Bjornson said residents told him they were afraid of going to authorities with information because of gang threats.
"Because I knew every name, every person, from the time that my son was murdered until now," he said. "And I'm just glad that they're off the street."
Bjornson said police will issue a news release on Monday with more details of the arrests.