Police have released a sketch of a man who investigators believe attacked two Texas teenagers while they were on a date.  

The attacker shot the two girls, Mary Kristene Chapa, 18 and Mollie Olgin, 19 while they were at a South Texas park. Chapa survived the attack, but sustained extensive injuries

Portland Police Chief Randy Wright said Saturday that Chapa worked with a forensic artist a day earlier to refine the sketch that had been released earlier this month.

Police say the suspect's description remains the same: a 5-foot-8-inch, 140-pound white male in his 20s with brown hair.

Family and friends have told police the women were a couple, but police Chief Randy Wright said in a statement late Tuesday that "there is no current evidence to indicate the attacks were motivated by that relationship."

Visitors to the park saw the women in tall grass below an observation deck.

Gay and lesbian advocacy groups the Human Rights Campaign and Equality Texas condemned the shootings and urged a thorough investigation. Chuck Smith, deputy executive director of Equality Texas, said he was satisfied with the investigation thus far.

"I think on some levels, regardless of the fact that they were gay, it's a horrific crime that touches people just because of the simplest loss of life and that something like that happens in a small town," Smith said.

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