A woman whose body was found on Wednesday in a reservoir in Azpeitia, Guipuzcoa, had suffered severe impact to the head and face.
The woman is believed to be a 39 year old married mother of two from Zarautz (Guipúzcoa) who was last seen at midday on Wednesday.
The body was found at 17:15 on Wednesday near the Ibai-Eder dam in Azpeitia. Police found a BB gun at the site but have discounted this as being the murder weapon.
This is the second homicide in Guipúzcoa in the past week. On Saturday, a woman in Bergera was found dead from stab wounds. On Tuesday, police arrested a Portuguese man with whom she had been living.