Hannah Witheridge, 23, and David Miller, 24, were found dead on Sept. 15 on a beach on the southern Thai island of Koh Tao. Post-mortem examinations showed both suffered severe head wounds and Witheridge was raped.
The murders dealt a blow to Thailand's vital tourism industry, which is struggling to recover after months of political unrest and a May 22 coup, and the government called on police to solve the case quickly.
Myanmar migrant workers Zaw Lin and Win Phyo, both 21, initially confessed to the murders but later retracted their confessions saying they had been beaten and threatened by Thai police.
But Thai police deny those accusations and say they have solid evidence, including DNA evidence, against the two men who were arrested in October.
A committee set up by Myanmar's embassy in Thailand to investigate the case said they had interviewed about 40 Myanmar nationals who were working on Koh Tao at the time of the murders.