SISSETON, S.D. — Waynette Renville remembers clearly the last time she and her three younger sisters had a conversation together.

The four Sisseton Wahpeton Dakota women, all in different cities, arranged a group phone call on the night of Oct. 15, 2005.

Cozied up in her pajamas, Waynette caught up with her siblings about their days until eventually it was just her and her youngest sister, Lakota. Not long after, Lakota abruptly got distracted and dropped off the call.

Less than 10 hours later, the 22-year-old Lakota was found dead in an empty lot in Independence, Missouri, not far from her home in northern Kansas City. She was wrapped in a blanket and discarded with a “pile of trash,” Waynette said.

Twenty years later, the Renville family still has no answers as to what happened to La

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