The Canadian Prime Minister Justin Trudeau has condemned the killing of a Canadian hostage kidnapped by Islamist militants in the Philippines.
John Ridsdel, 68, was taken from a tourist resort with three others by the Abu Sayyaf group in September 2015.
In November, the Islamist militants released a video showing Mr Ridsdel and three other captives, and demanded a ransom of $80m (£55m).
Mr Trudeau called his death "an act of cold-blooded murder".
On Monday, a severed head was found on remote Jolo, hours after the Abu Sayyaf ransom deadline expired. Local authorities said it belonged to a foreign man but have not confirmed whether it belonged to any of the captives.
Mr Ridsdel was taken to Jolo after being kidnapped from a marina near the city of Davao, along with another Canadian, Robert Hall; a Norwegian, Kjartan Sekkingstad; and a Philippine woman, Mr Hall's girlfriend, Marites Flor.
Mr Ridsdel later warned in a video released by the group that he was due to be killed on 25 April if no ransom was paid.
The Canadian government has a policy against paying ransoms, The Globe and Mail cited a government official as saying.