Bernardo Montoya, 50, has been arrested in connection with the murder of 26-year-old teacher, Laura Luelo, whose half-naked body was dumped close to the village of El Campillo in south-western Andalucia.
Montoya, who was only released from jail in October, after serving time for violent robbery, had a previous conviction for murder.
The criminal was detained after a car chase and was then caught after running away on foot by the Guardia Civil.
Laura had travelled 500 kms from the north-western city of Zamora to take up her first full-time job, and her disappearance last week from her school, where she only started work on December 3rd, sparked a search by other 200 volunteers and police officers.
Her body was found in some bushes, and she appeared to have been strangled as well as sexually assaulted.