A man upset about his high school-age daughter's relationship with a woman killed the girlfriend and her mother in a Southeast Austin home Monday night, culminating a months-long feud between the families, police said Tuesday.

Jose Alfonso Aviles, 45 , went to the house in the 7100 block of Dixie Drive where Norma Hurtado, 24, lived with her mother and shot both women after knocking on the door, officials said Tuesday. He has been charged with capital murder and could receive life in prison or the death penalty if convicted.

Police said they are looking for a second unidentified man who witnesses said fled the scene with Aviles in a green sport utility vehicle.

Aviles' daughter, who was in the home at the time, found Norma Hurtado and her mother, 57-year-old Maria Hurtado , after they were shot, according to police and court documents.

The daughter's "family was quite upset over this relationship," Austin police Lt. Gena Curtis said Tuesday. "This had been an ongoing dispute between these families and it turned tragic, into a horrific act of violence with the death of two individuals."

The daughter told police that she and Norma Hurtado had been involved in a lesbian relationship, which her father did not approve of, and that there had been disturbances between Aviles and Norma Hurtado, according to an arrest affidavit. An online records search for those incidents turned up a report of a sexual assault in September and a family disturbance in October; however, police did not release details of the incidents.

The American-Statesman is not identifying the daughter.

The affidavit said a witness told police that the daughter's parents would send threatening text messages to Norma Hurtado. In one message, Aviles threatened to kill Hurtado and her mother, the document says.

"She stated that (the girlfriend's) parents have sent text messages threatening Norma because of this relationship," the witness, a friend of Norma Hurtado's, told police. About a month ago, the witness "saw a text message from (Aviles) to Norma in which (he) threatened to kill both Norma and her mother," police said.

According to the daughter's Facebook posts, she and Norma Hurtado had a tumultuous relationship over the past several months and talked about having patience until they could be together.

Friends of the daughter, who they said turned 18 last month, said Tuesday that her parents did not approve of her being in a gay relationship. The Travis County district attorney's office has not determined whether the case will be classified as a hate crime.

"It is something we will have to take a look at after the investigation is more complete," said Jackie Wood, an assistant district attorney and a member of the office's hate crime task force.

While police were investigating Monday night, Aviles' wife and son arrived at the scene of the shooting and told officers they were searching the area for him, the affidavit says. Roselia Martinez told officers that she thought her husband was intoxicated and that he owned an automatic pistol.

After the shooting, Aviles went to the home of a relative, who called police, the arrest affidavit says.

"Jose was nervous, intoxicated, and had a gun in his waistband," police said the relative told them. "Jose repeated that he had 'done something' and needed their help."

Early Tuesday morning, the Lone Star Fugitive Task Force found Aviles in a remote spot in Bexar County and, with the assistance of more than two dozen law enforcement officials and a San Antonio police helicopter, arrested him, an official for the U.S. Marshals Service said. Aviles was being held without bail Tuesday in the Bexar County Jail, and the Marshals Service was working with local authorities on a plan to transfer him to Travis County.

At Aviles' home, Martinez allowed a reporter and then a photographer inside Tuesday afternoon. But before an interview began, about a dozen family members gathered in the kitchen asked both to leave.

A number of neighbors on Quicksilver Boulevard, about a mile south of East William Cannon Drive, said they did not interact much with Aviles or his family but expressed surprise and disbelief upon learning of his arrest, describing him as friendly and humble.

"They seem like peaceful people," said Patricia Mendoza, who lives two doors down.

"We never had problems with them," said a man who lives across the street, who asked not to be identified. Neighbors said they believed Aviles was in the landscaping business.

Police said they continue to investigate what role the other man seen at the home might have played. But they emphasized Tuesday that the case is an isolated one.

"We still have many questions we need answers to," Curtis said. "There is no fear for the community; this was isolated to this family, to this household, between these individuals. There is no immediate danger to anyone in the community."