On November 1, 1878, Garayo visited a mill outside Vitoria that he had been previously to and found the female miller cooking alone.
After some words he tried to strangle her, but Garayo, 57 at the time, was overpowered by the woman and forced to flee.
She denounced him and Garayo was arrested and sentenced to two months in prison.

On August 25, 1879, Garayo left Vitoria through the road to Castile.
Between the villages of Gomecha and Aríñez, he found an old beggar woman and offered her alms.
He then pushed her off the road; she fell and hurt her head on a rock.
However, when Garayo jumped over her, she kicked him in the belly and he fell backwards.
The woman got up and ran to Vitoria, screaming.
Garayo followed her from a distance, and arriving in Vitoria he asked his fourth wife to speak with the woman and reach an agreement that would keep him out of jail.
The victim wanted to denounce him, but eventually agreed not to in exchange for 20 pesetas (80 reales).
Until the woman was convinced, Garayo cautiously left the city and looked for work in the Somorrostro mines, in Biscay.

On the way back to Vitoria, on September 7, he latched to a 25-year-old woman from Zaitegui, María Dolores Cortázar, who had worked as a maid in Vitoria and began to converse with her.
Once he was sure that no one else was around (a mail service employee had passed them and seen them talking together), he pushed her off the road, took her handkerchief and tied it to her neck, asking for sex and promising discretion and money in return.
As the victim kept resisting, he threatened her and finally stabbed her multiple times in the chest with a razor.
He raped her and then stabbed her in the belly again until she died.

Garayo hid the body and the food basket that the victim had been transporting, but rather than continuing to Vitoria he took a detour through the mountains where he was seen by a farmer looking for a cow, drank in a road inn called "Venta del Grillo", and slept under a bridge on the Zadorra River, in the vicinity of Arriaga.
He woke up at dawn and had breakfast in an inn of Arriaga, but once again, instead of continuing to Vitoria, he returned to the bridge, left the road and climbed the hill of Araca.
There he happened upon a 52-year-old farmer woman from Navarrete, Manuela Audícana, who had come to Vitoria for the festival and was going back home with some food she had bought.
The two conversed until it began to rain, and sought refuge beneath a tree.
Garayo, who had claimed at first to be looking for a lost mare, confessed his true intentions and the woman attempted to flee, but he seized her and strangled her with her own apron.
He took off all her clothes, but found himself unable to perform.
As the woman was still breathing, he stabbed her in the heart and the belly with the same razor used in the previous crime, then cut the belly open and extracted the intestines and a kidney.
He cleaned the blood on his hands with the victim's clothing, covered the body, ate the food in her basket, and slept again under the same bridge.
In the morning, he threw the razor in the river and cleaned himself before returning to Vitoria at last, changing clothes and leaving almost immediately for Alegría.
The two bodies were discovered that day.
On November 1, 1878, Garayo visited a mill outside Vitoria that he had been previously to and found the female miller cooking alone. After some words he tried to strangle her, but Garayo, 57 at the time, was overpowered by the woman and forced to flee. She denounced him and Garayo was arrested and sentenced to two months in prison.
On August 25, 1879, Garayo left Vitoria through the road to Castile. Between the villages of Gomecha and Aríñez, he found an old beggar woman and offered her alms. He then pushed her off the road; she fell and hurt her head on a rock. However, when Garayo jumped over her, she kicked him in the belly and he fell backwards. The woman got up and ran to Vitoria, screaming. Garayo followed her from a distance, and arriving in Vitoria he asked his fourth wife to speak with the woman and reach an agreement that would keep him out of jail. The victim wanted to denounce him, but eventually agreed not to in exchange for 20 pesetas (80 reales). Until the woman was convinced, Garayo cautiously left the city and looked for work in the Somorrostro mines, in Biscay.
On the way back to Vitoria, on September 7, he latched to a 25-year-old woman from Zaitegui, María Dolores Cortázar, who had worked as a maid in Vitoria and began to converse with her. Once he was sure that no one else was around (a mail service employee had passed them and seen them talking together), he pushed her off the road, took her handkerchief and tied it to her neck, asking for sex and promising discretion and money in return. As the victim kept resisting, he threatened her and finally stabbed her multiple times in the chest with a razor. He raped her and then stabbed her in the belly again until she died.
Garayo hid the body and the food basket that the victim had been transporting, but rather than continuing to Vitoria he took a detour through the mountains where he was seen by a farmer looking for a cow, drank in a road inn called "Venta del Grillo", and slept under a bridge on the Zadorra River, in the vicinity of Arriaga. He woke up at dawn and had breakfast in an inn of Arriaga, but once again, instead of continuing to Vitoria, he returned to the bridge, left the road and climbed the hill of Araca. There he happened upon a 52-year-old farmer woman from Navarrete, Manuela Audícana, who had come to Vitoria for the festival and was going back home with some food she had bought. The two conversed until it began to rain, and sought refuge beneath a tree. Garayo, who had claimed at first to be looking for a lost mare, confessed his true intentions and the woman attempted to flee, but he seized her and strangled her with her own apron. He took off all her clothes, but found himself unable to perform. As the woman was still breathing, he stabbed her in the heart and the belly with the same razor used in the previous crime, then cut the belly open and extracted the intestines and a kidney. He cleaned the blood on his hands with the victim's clothing, covered the body, ate the food in her basket, and slept again under the same bridge. In the morning, he threw the razor in the river and cleaned himself before returning to Vitoria at last, changing clothes and leaving almost immediately for Alegría. The two bodies were discovered that day.
Juan Díaz de Garayo