Gladys del Estal Ferreño was an ecologist activist from San Sebastián, Gipuzkoa, Spain (Caracas, 1956 - Tudela, 1979).

She was killed by a bullet shot at her by the Guardia Civil during a protest in Tudela, Navarre, against the nuclear station construction program for the Basque Country, and the aircraft firing range of Bardenas.

A Civil Guard squad approach them, and the guardsman José Martinez Salas[4] shot the young activist in the back of the head, causing her immediate death.

[2] The author of the shot was judged, receiving a sentence of 18 months imprisonment in December 1981 for "reckless endangerment", since the tribunal in Pamplona deemed his action was 'unintended'.

Just the opposite, fellow ecologist activists who prefer to remain anonymous state that the officer José Martínez Salas would direct an obscene comment at her, for which she insulted him.