An autopsy revealed both victims had been hit by a hard object, according to Maj. Gen. Pornchai Suteerakhun, the head of the Police Hospital's Institute of Forensic Medicine.
Miller was hit and had scratches on his back, in addition to having water in his lungs consistent with drowning, an autopsy showed. Witheridge was hit several times on her head and face and her body had evidence of sexual intercourse, according to her autopsy.