The person at the center of this case
Alvin Alton Long Soldier Jr.
Missing Person · Open
5 years waiting · since 2020
Missing Person: Alvin Alton Long Soldier Jr
Justice for Alvin Alton Long Soldier Jr. — the trail went cold in 2020, but the truth hasn't.
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Key leads to think about
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timeline
Lead #1Why has there been no contact with family for six years? Was there a triggering event on or around December 10, 2020?
👁️
witness
Lead #2Did anyone see Alvin in Vermillion after December 10, 2020, or have information about his activities that day?
💡
clue
Lead #3What were the circumstances that led to his disappearance—was he known to travel, and did he have any known associates in the area?
Alvin Alton Long Soldier Jr., a 51-year-old American Indian male, was last known to be in Vermillion, South Dakota on December 10, 2020, and has not contacted his family for approximately six years. The circumstances of his disappearance remain unclear, and investigators have not determined whether he left voluntarily or met with foul play. Anyone with information about Alvin's whereabouts or activities since December 2020 is urged to contact the Bureau of Indian Affairs.
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Official wording
Source Narrative
NamUs case MP158972. Missing person: Alvin Alton Long Soldier Jr.
Last known contact: 2020-12-10 in Vermillion, Clay, SD. Circumstances: Alvin was last known to be in Vermillion, SD and has not contacted his family for approximately 6 years.
Demographics: 51 years, Male, American Indian / Alaska Native. Physical description: 6 ft 1 in, 170 lbs, hair: Black, eyes: Brown.
Investigating agency: Bureau of Indian Affairs | I-26-0000000252.
Timeline of Events
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2020-12-10
Last Known Contact
Alvin Alton Long Soldier Jr. was last known to be in Vermillion, South Dakota. He has not contacted his family since this date.
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:December 10, 2020
Last Updated:June 5, 2026
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Any information, no matter how small, could be crucial to solving this case.
Phone: 6053412123
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Case Information
Incident:December 10, 2020
Last Updated:June 5, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 6053412123
You can remain anonymous