Police are continuing their investigation into the death of Olha Frolova, a Ukrainian woman whose body was found in a ditch on Koh Samui last week, after the latest autopsy result failed to determine how she died.
Investigators are now waiting for results of a DNA test and another one to determine whether she had been sexually assaulted.
Pol Maj Gen Thakoon Natepukkana, chief of Surat Thani police, and authorities on Tuesday travelled to Samui to examine the scene of the crime and attend a meeting with investigators.
Maj Gen Thakoon instructed forensic scientists to collect evidence within a 100-metre radius of where her body was found.
He also ordered an examination of footage from surveillance cameras along a 1.8-kilometre stretch of road leading up to the scene, and near to where a signal from Frolova's phone was last detected.
Frolova, 32, was found dead by a local hotel employee in a ditch covered with coconut leaves on Sunday on the popular tourist island.
Her estranged husband, Dimas Frolova, filed a missing person report with local police two weeks prior.
He told investigators his wife left him two months ago and went to stay with her new boyfriend, taking their son with her.
She had contacted a lawyer and prepared to file for a divorce.
Her body had been taken to Koh Samui Hospital for the autopsy.