Unsolved true crime podcast bringing attention to cases that need it.

Researched, written and hosted by crime analyst Leah Owens. Co-hosted by Scott Owens.

UNSOLVED SUSPICIOUS DEATHS: ARNOLD ARCHAMBEAU AND RUBY BRUGUIER

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When three young South Dakotans survive a car crash, two of them walk away from the vehicle and aren’t seen again for three months, when their bodies are inexplicably discovered near the site of the crash. Question after question arises as investigators attempt to make sense of one of the most perplexing cases in South Dakota history in this episode of Last Seen Alive.

Arnold Archambeau and Ruby Bruguier were 20 and 18-years-old, respectively, at the time of their December 12th, 1992, disappearances. Their deaths followed soon after their disappearances, and the circumstances remain a mystery to this day.
Arnold and Ruby grew up on the Yankton Sioux Reservation in Lake Andes, South Dakota and were high school sweethearts. Both were well-liked among their community–whether their deaths were accidental or a result of foul play is unknown.

Sources used to research this episode:

Arnold Archambeau and Ruby Bruguier (Unsolved Mysteries / unsolved.com)

Video: Unsolved Mysteries Season 7, Episode 18 (Unsolved Mysteries via YouTube)

Area Sheriff Leaves Office After 28 Years (The Mitchell Republic)

FBI Closes Case in Strange Deaths of Lake Andes Pair (Sept. 12th, 1999 edition of the Rapid City Journal)

Argus-Leader from Sioux Falls, South Dakota · Page 13 March 5, 1993

The Effect of Body Mass on Outdoor Adult Human Decomposition (Lindsey G. Roberts et al / Journal of Forensic Science)

The Effect of Body Size on Decomposition in a Temperate Region of South Africa (A. Sutherland et al / International Forensic Science Journal)

Weather History for Lake Andes, SD (Farmer’s Almanac)

Argus-Leader from Sioux Falls, South Dakota · Page 2 April 18, 1995 (The Argus-Leader)

Argus-Leader from Sioux Falls, South Dakota · Page 2 March 20, 1993 (The Argus-Leader)

If you have any information about the deaths of Arnold Archambeau and Ruby Bruguier, please call the Charles Mix County Sheriff’s Office at (605)487-7625.

3 responses to “UNSOLVED SUSPICIOUS DEATHS: ARNOLD ARCHAMBEAU AND RUBY BRUGUIER”

  1. Lynn Avatar
    Lynn

    Did the authorities ever try the keys found on Arnold to the couples house and/or car? The couple the witness said Arnold was with after the accident and even talked to. Also, did they determine the cause of death for both Arnold and Ruby?

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    1. admin Avatar
      admin

      Investigators attempted to figure out what the keys went to, but were unable to match them with any buildings or vehicles. The coroner considered exposure to be the cause of death for both Ruby and Arnold. Deputy Youngstrom, who investigated their deaths, believes it’s possible that they froze to death, but is adamant in his belief that regardless of how they died, neither of them died in the ditch where their bodies were eventually found.
      -Leah

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  2. Susan Wester Avatar
    Susan Wester

    This is so easy to follow, and listen to, and informative!! I love your banter, and dry humor. My new crime podcast!

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