A second Qatari, Mohammed Hasan Abdulaziz, was given three years in prison for aiding the first convict, Badr Khamis Abdullah Hashim in "burning the body of Lauren Patterson and erasing evidence" of the murder, sources said.
The men were arrested after the teacher's charred remains were found by campers near Doha.
Patterson, who taught at a primary school in Doha, was last seen leaving the night club of a luxury hotel with two men, British media had reported. Her body was found soon afterwards.
According to rights group Death Penalty Worldwide, the last judicial killing in Qatar was in 2003 when a murderer was executed by firing squad.
