Zaw Lin, co-defendant with his friend Win Zaw Htun, testified earlier this month in detail about the brutal methods Thai police allegedly used during their interrogation and how he was threatened with death if he did not confess. The two men, both 22 and bar workers on Koh Tao, acknowledge being on the beach the night the two Britons were killed, but deny any part in the crime. Thai authorities insist DNA evidence proves their guilt.