"We have made formal identification," said Belize Police Insp. Dinsdale Thompson, who added that the wounds sustained by Townsend show that he was killed.
"We do know, that for sure, that it is a homicide and we are looking [in] that direction as well of the motive, of why they have killed him."
Police have two suspects and are working with authorities in Guatemala in tracking them down.
The confirmation was first revealed through a posting by a family member on the "Brian Townsend — Missing Belize" Facebook page: "With grieving hearts we inform you that the body found in Guatemala is Brian Townsend."
Townsend, 64, had been living and working in the Central American country for nearly a decade.
He was last heard from on Christmas Day when he asked his cook to prepare dinner for him. By the time she got to his house, Townsend was gone.
His vehicle was missing and it looked like his house had been vandalized. The cook also saw a trail of blood outside the house.
Kory Townsend flew to Belize on Saturday to help look for his father. He called off the search after he learned a body has been found in the river, just over the border in Guatemala.
Townsend says the Canadian consulate has been instrumental in arranging the identification.
“I’m exhausted. I’m trying to stay strong and and finish this process out,” he said.