SAN ANTONIO — An 18-year-old man was arrested Monday after police say he attacked his ex-girlfriend outside her home, the latest in what investigators describe as a yearlong pattern of violence and threats.
Francisco Nuncio-Castaneda faces charges of continuous family violence and stalking. Police say Nuncio-Castaneda and his 19-year-old ex-girlfriend had been together for about three years and have a child together.
The most recent incident happened Aug. 16, when police say Nuncio-Castaneda showed up unannounced at the woman’s home in a maroon pickup truck and contacted her through Instagram, telling her to come outside.
According to the arrest report, Nuncio-Castaneda told the woman to get into his truck. When she refused, police say he grabbed her by the arms and tried to force her inside.
The woman broke free and ran toward her front door while calling for her mother. Police say Nuncio-Castaneda chased her, grabbed her by the hair and pulled her to the ground.
Investigators say he then repeatedly punched her in the face and head and kicked her in the stomach and torso.
The woman’s mother heard her screaming and opened the front door. Police say she saw the attack and yelled at Nuncio-Castaneda, who then got back into his truck and drove away.
Officers said the woman had a cut and bleeding lip, redness on her face and torso, marks on both upper arms and scratches across her back and arms.
The arrest report shows police had already been investigating another alleged attack involving the same couple. On July 31, police say Nuncio-Castaneda confronted the woman at her home, grabbed her by the hair and other parts of her body and left her with scratches and injuries to her neck, chest and legs.
Investigators say police were called to the woman’s home 17 times between August 2025 and Aug. 16 of this year for incidents involving Nuncio-Castaneda and the woman. Those calls included reports of assaults, threats and property damage.
In an earlier case, the woman told police Nuncio-Castaneda repeatedly called her and sent unwanted messages through Instagram. According to court records, she said he threatened to come to her home, kill her and burn down the house.
Investigators also used license plate cameras as part of their investigation. Police say a maroon Ford F-150 associated with Nuncio-Castaneda was captured near the woman’s home on multiple occasions even though he lived about 7.6 miles away.