Marc Brennecke is regarded as one of the most ruthless mass murderers in Thailand. Along with his mistress, he lured eight wealthy "Farangs" (White Skinned Foreigners) to Thailand and brutally murdered them, stripping their bank accounts in the process. The law was unable to gather any evidence against the homicidal pair during the three years that the crimes were committed.

Marc Brennecke, like Al Capone at the time, received a prison sentence only for tax evasion. But before he was arrested, he disappeared from the scene and was never seen again. To this day, the precise number of victims that fell foul of him is unknown.