Their killer took his own life shortly after the attack and his motive remains a mystery.
A 6-year-old girl and her parents were found dead inside a tent alongside her parents at the Maquoketa Caves State Park campground.
Investigators say the killer was 23-year-old Anthony Sherwin, who died from a self-inflicted gunshot wound after the family was attacked early on the morning of July 22. Sherwin was at the park camping with his parents at the time of the attack.
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