Commissioner Pol Lt Gen Panya Mamen has now reported that police investigators have obtained a key witness who said foreigner killed the two British tourists in Koh Tao island.
The Nation Online website quoted Pol Lt Gen Panya Manen as telling the online newspapers today that the team of police investigators have met a key witness who claimed seeing foreigner killed the two tourists.
The Thai PBS News reported on its site that no further details were produced as to whether the witness is a male or female or the witness is a local or a foreigner, and how many were involved in the murder of the two foreigners.
But this latest disclosure, if confirmed, will be a significant turn of the probe which earlier focused only on locals and migrant workers after DNA testing revealed the mixed semen found inside Ms Hannah Witheridge belonged to Asians.
More than 300 migrant workers and locals were rounded up to have their DNA samples tested. But none has matched DNA found in her body.
The disclosure of the key witness who the police still kept confidential would give new clue to the brutal murder of Ms Hannah and her friend David Miller.