Local police have often explained the deaths as accidents or suicides, but many cases appear suspicious to family members of the deceased, and are often left insufficiently investigated.
The families David Miller and Hannah Witheridge who were killed in 2014 now face fresh agony after convicted killers Zaw Lin and Win Zaw Htun, both 29, demanded a review into the case.
The families of two British backpackers who were killed in Thailand 10 years ago are facing fresh agony after the two convicted killers have demanded a review of the case.