SAN ANTONIO -- A 26-year-old prostitute was fatally wounded while she was walking Wednesday night in a West Side neighborhood.

Emmy Torres, a mother of four, was shot once in the side and died in the 1400 block of Loma Vista around 10 p.m., police said.

"We do have a bunch of people saying they heard one gunshot and possibly a car drive-off," said Sgt. Matthew Podwika of the San Antonio Police Department.

Investigators hope that someone will come forward with information that will lead them to a suspect or a motive.

"We don't understand who did it, why they did it, but we're going to find out who it was," said Mary Alice Martinez, the victim's sister-in-law.

Martinez said that Torres was walking with her ex-husband when she was shot and that it was possible that the killer may have been a "John" who might have been jealous.