SAN ANTONIO -- An 18-year-old neighbor was arrested Friday in the slaying of restaurant owner and operator Viola Barrios.

Joe Estrada was charged with capital murder, San Antonio Police Chief Bill McManus said at a Friday morning news conference. McManus was accompanied at the press conference by the victim's son, Louis Barrios, and Bexar County District Attorney Susan Reed.

McManus said two 911 calls from concerned neighbors who saw Estrada in Barrios' car helped police apprehend the suspect.

Estrada was first questioned by police and was released before he was arrested, McManus said.

The chief added that robbery was a motive.

"The motive was burglary and yes, I guess you could say it was bungled," McManus said. "I don't think it was necessarily random. I think it was probably planned."

Estrada told police he had an accomplice lined up, but McManus said they were not sure of the second person's actions in the crime and were looking to question the person.

Police initially brought Estrada in for questioning, released him and later obtained an arrest warrant, McManus said.

Reed confirmed the capital murder charge was filed, but additional comments suggest she may seek the death penalty in the case.

"As of right now I'd like to go string this guy up myself," Reed said, adding that seeking the death penalty is a possibility.

Barrios said that his mother didn't have any enemies.

"She was targeted because she drove a silver Mercedes," he said.

The arrest came hours after police located the car that was stolen at the time Barrios, the owner of Los Barrios Mexican Restaurant, was slain at her home.

Barrios' E350 Mercedes Benz was found at the Village of Hampton Cove Apartments at 11300 Expo Boulevard around 2 a.m., police said.

The 76-year-old matriarch's body was found by firefighters inside her home Thursday morning in the 10800 block of Tioga.

Police said whoever killed her set the home on fire to cover up the slaying.

Barrios said that his mother was getting ready to move into a new home that was being constructed in a gated community for security reasons.

"In less than two weeks she was going to be here so I wouldn't have this risk that I always had because of her prominence and notoriety of the restaurants," Barrios said.

The matriarch used the last $3,000 she had to found the restaurant in 1979 to help raise her three children after she had lost her husband four years earlier in a car crash.

"The restaurant was not a dream per say, it was a last hope," Barrios said. "She gave her life so we could live a better life."

Viola Barrios worked seven days a week and became an inspiration to women in the business and a philanthropist to the poor in her hometown in Mexico.

Louis Barrios said that his mother's legacy will be more than just her cooking. It will include her passion and committment to the community.

UPDATE: 4:46 p.m. -- Police executed a search warrant Friday afternoon at the home of Joe Estrada, who lived next door to his alleged victim, Viola Barrios. Detectives at the scene removed one bow and several arrows from the home. The items were removed and classified as evidence possibly connected to the crime, a detective told KSAT 12 News.

UPDATE: Funeral arrangements for Viola Barrios have been announced. Visitation will be from 4 to 9 p.m., Sunday, with a rosary to begin at 6 p.m. A funeral mass will begin at 10 a.m., Monday. Both events will be held at St. Gregory the Great at 700 Dewhurst Road. A burial service at San Fernando Cemetary No. 2 will follow the service.