The person at the center of this case
Marlane L Koue Castaneda
Missing Person · Open
13 years waiting · since 2012
Missing Person: Marlane L Koue Castaneda
Justice for Marlane L Koue Castaneda — the trail went cold in 2012, but the truth hasn't.
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Key leads to think about
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person
Lead #1What were Marlane's activities and plans on October 1, 2012?
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witness
Lead #2Who was the last person to see or speak with Marlane?
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clue
Lead #3Were there any unusual circumstances or concerns noted before her disappearance?
Marlane L Koue Castaneda, a 54-year-old woman, was last seen on October 1, 2012, in Carlsbad, San Diego, California. Nearly 14 years later, the circumstances of her disappearance remain unclear and she has not been located. The Oceanside Police Department continues to seek information from anyone who may have encountered her or have knowledge of what happened.
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More leads to consider
Beyond the top three above — each detail below could be the thread that pulls this case open.
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contact
Lead #4Has anyone reported seeing a woman matching her description since 2012?
Have information about any of these leads?
Even the smallest detail could be the key to solving this case.
Official wording
Source Narrative
NamUs case MP18159. Missing person: Marlane L Koue Castaneda.
Last known contact: 2012-10-01 in Carlsbad, San Diego, CA. Circumstances: Last seen on 10/01/2012 Demographics: 54 years, Female, White / Caucasian.
Physical description: 5 ft 3 in, 150 lbs, hair: Red/Auburn, eyes: Brown. Investigating agency: Oceanside Police Department | 12013655.
Timeline of Events
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2012-10-01
Last Known Contact
Marlane L Koue Castaneda was last seen on October 1, 2012 in Carlsbad, San Diego, California.
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:October 1, 2012
Last Updated:June 3, 2026
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Any information, no matter how small, could be crucial to solving this case.
Phone: 7604354846
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Case Information
Incident:October 1, 2012
Last Updated:June 3, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 7604354846
You can remain anonymous