Two Texas teen-aged lesbian girls found dead

Last week, 2 teen aged girls were found dead in Texas. From the article:

A witness has come forward in the murder of a teenage lesbian and the shooting of her girlfriend in Texas, authorities said. 

Mollie Olgin, 19, and 18-year-old Mary Kristene Chapa were both shot in the head in a park in Portland and Olgin was pronounced dead at the scene, while Chapa is still in hospital.

And now a witness to the shooting has told police that the suspect is a white male in his 20s with dark hair, weighing 140 pounds and standing five-foot-eight-inches tall. (...) 

Portland Police Chief Randy Wright told msnbc.com that authorities had not yet been able to establish whether the girl’s sexuality ‘had anything to do with the attack'.

'It appears as if this was not just a random attack but that’s something that we really have to develop over time,’ he added.

Investigators discovered a bullet casing from a gun next to the victims but have not yet found a weapon.

A resident living near the park reported hearing two loud bangs before midnight on Friday but thought they were from firecrackers, according to the Corpus Christi Caller Times.