A commander who had secret meetings with a woman known as the 'fontanera' documented phone calls with Mercedes González. The commander, who is being investigated in the 'caso Koldo', provided information about the meetings to the director of the Guardia Civil. The meetings took place in a bar in Leganés in March 2025.

After a couple of meetings, there was impatience from higher authorities. Further details about the case and the commander's involvement can be found in El Mundo, which has more information on the story.