PORTLAND, Texas -- A witness has emerged in the shooting of a young lesbian couple that left one dead and the other fighting for her life, police say.

The teenagers were found the morning of June 23 in tall grass at Violet Andrews Park in Portland, Texas. Molly Judith Oglin, 19, was dead, and Mary Kristene Chapa, 18, was in grave condition. Both teens had been shot in the head.

The witness described the suspect as a dark-haired white male in his 20s, about 5-8 and 140 pounds, according to a police statement.