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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person
Lead #1Why has there been no contact with family for six years—does this suggest voluntary departure or involuntary disappearance?
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location
Lead #2What was Alvin's activity or purpose in Vermillion on December 10, 2020?
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witness
Lead #3Were there any witnesses to Alvin's presence in Vermillion around the time of his last known contact?
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 encountered foul play. The case remains open with the Bureau of Indian Affairs, and anyone with information about his whereabouts is urged to come forward.
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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
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:December 10, 2020
Last Updated:June 2, 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 2, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 6053412123
You can remain anonymous