The person at the center of this case
Frank William O'Brien (age 55, male)
Missing Person · Open
3 years waiting · since 2023
Missing Person: Frank William O'Brien
Justice for Frank William O'Brien (age 55, male) — the trail went cold in 2023, but the truth hasn't.
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Key leads to think about
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vehicle
Lead #1Where is the S/V Ocean Bound? The 44-foot sailboat vanished without distress signals or wreckage reports.
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person
Lead #2What happened to the three people aboard—Frank O'Brien, his wife Kerry, and William Gross?
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evidence
Lead #3Were there any maritime incidents, weather emergencies, or mechanical failures that could explain the disappearance?
Frank William O'Brien, a 55-year-old sailor, disappeared on April 4, 2023, while sailing the 44-foot S/V Ocean Bound with his wife Kerry and fellow sailor William Gross near Mazatlan, Mexico en route to San Diego. The vessel and all three people aboard vanished without a trace, and extensive search efforts in the area failed to locate them or the boat. The circumstances of their disappearance remain unknown, and the case seeks any information about the vessel's location or the fate of those aboard.
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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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location
Lead #4Why did extensive searches near Mazatlan fail to locate the vessel or any debris?
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Official wording
Source Narrative
NamUs case MP103573. Missing person: Frank William O'Brien.
Last known contact: 2023-04-04 in San Diego, San Diego, CA. Circumstances: Frank and his wife Kerry and another sailor, William Gross, were sailing aboard the 44-foot S/V Ocean Bound.
They were last heard from on 04/04/23 near Mazatlan, Mexico enroute to San Diego. Extensive searches of the area were unsuccessful in locating them or the boat.
Demographics: 55 years, Male, White / Caucasian. Physical description: 5 ft 8 in, 170 lbs, hair: Blond/Strawberry, eyes: Blue.
Investigating agency: Anchorage Police Department | 230013487.
Timeline of Events
👁️
2023-04-04
Last contact with S/V Ocean Bound
Frank O'Brien, his wife Kerry, and sailor William Gross were last heard from aboard the 44-foot sailboat S/V Ocean Bound near Mazatlan, Mexico while en route to San Diego, California.
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:April 4, 2023
Last Updated:September 26, 2026
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Phone: 9077868900
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Case Information
Incident:April 4, 2023
Last Updated:September 26, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 9077868900
You can remain anonymous