State Directory

Cold Cases in South Dakota

ColdCaseIndex documents 3 cold cases in South Dakota, spanning 1976–2019. 2 of these cases remain fully unsolved. Each case page includes documented details, status, and information on how to submit a tip.

3 Documented Cases

2 Still Unsolved

1976–2019 Year Range

2 Case Types

By Type

2 Missing Persons 1 Homicide

By Status

2 Unsolved 1 Conviction

All South Dakota Cases

Unsolved 2019

Serenity June Dennard

Nine-year-old Serenity Dennard ran away from the Black Hills Children's Home near Rockerville, South Dakota, on the frigid morning of February 3, 2019, and was last seen walking north on Rockerville Road without a coat.

Rockerville Missing Person Age 9

Unsolved 2013

Rachel Lucille Cyriacks

Rachel Cyriacks, a 30-year-old mother of three from Woonsocket, South Dakota, vanished on November 13, 2013, after driving to Huron to pick up her estranged husband, Brad Cyriacks, who was being released from jail. Her p

Woonsocket Missing Person Age 30

Conviction 1976

Anna Mae Aquash

Mi'kmaq activist Anna Mae Aquash was found shot dead on the Pine Ridge Reservation. She had been an American Indian Movement leader. Arlo Looking Cloud and John Graham were eventually convicted of her murder in 2004 and

Pine Ridge Homicide Age 30