Dixie Mendez was 24 when she was killed on August 17, 2014, in Houston. She was at a friend’s gathering — a 15-year-old’s birthday party with about 50 people — and was sleeping in a back room around 1 a.m. when a stray bullet struck her in the head and killed her instantly. She had recently learned she was pregnant.

An argument outside the house escalated into gunfire. Witnesses said a group of teens returned to the party and fired multiple shots; one round from an AR-15-style rifle passed through a wall and fatally wounded Mendez. Despite many witnesses, no arrests have been announced and the shooter remains unidentified. Crime Stoppers has offered a reward and the Houston Police Department has appealed for information.

Her mother, Sarah Mendez, has kept a storybook of her daughter’s life and publicly urged anyone with information to come forward for justice and closure for the family and the unborn child. If anyone was at that party or knows anything about the argument and who fired into the house, please share what you know with investigators.