Four-metre croc euthanised after boy's body found

A four-metre crocodile was located in an area north of Cairns were a boy was killed (file pic). (Dean Lewins/AAP PHOTOS)

A huge crocodile believed to be responsible for a fatal attack on a 16-year-old boy in the Torres Strait has been euthanised.

Wildlife officers began a search for the reptile after the teenager's body was found on a remote far north Queensland island on Thursday afternoon.