A 17-year-old originally from Banbury died after being made to drink petrol, pathologists believe.
The body of Simon Everitt, who was born in the town, was found in Mautby, Norfolk, last month, three weeks after he vanished from Great Yarmouth.
Last night police said they believed he had been tied to a tree, was made to drink petrol and been set on fire.
A post mortem examination showed he died as a result of inhaling combustible fluid.
His body had been buried in a ditch.
Three people, Jimi Lee Stewart, 24, Maria Chandler, 40, both of Great Yarmouth, and Jonathan Clarke, 19, of Telford, Shropshire, are due before Norwich Crown Court on July 14 charged with murder.
Simon was born in Banbury and grew up in Bishop Auckland, Durham. He and his father Vince moved to Great Yarmouth four years ago.
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