In 1991, four teenage girls were killed in Austin. Decades later, their cold case is the subject of HBO docuseries "The Yogurt Shop Murders."

When filmmaker Margaret Brown decided to direct The Yogurt Shop Murders, she initially worried that making a film about it would cause her to confront an open wound.

"The Yogurt Shop Murders," is slated to debut Aug. 3. The series delves into the events of December 6, 1991, when four girls were found murdered inside an I Can't Believe It's Yogurt! shop