A new HBO documentary is revisiting the emotional toll the 1991 quadruple homicide at a yogurt shop in Austin, Texas, still has on the community, more than 30 years later.

"The Yogurt Shop Murders" investigates the murders of Amy Ayers, Jennifer Harbison, Sarah Harbison and Eliza Thomas on Dec. 6, 1991, through archival footage and interviews with investigators, plus the friends and families of the four victims.

"For one, it's been 30 years, seven months and five days and i still can't believe it," Bob Ayers, the father of victim Amy Ayers, said in the first episode of the series, which premiered on Aug. 3.

Over the series' four episodes, which premiere on Sundays at 10 p.m. ET on HBO, those close to the case show how the slayings have continued to go unsolved for more than three deca

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