The person at the center of this case
Frank William O'Brien
Missing Person · Open
3 years waiting · since 2023
Missing Person: Frank William O'Brien
Justice for Frank William O'Brien — 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 #1What happened to the 44-foot sailboat S/V Ocean Bound? Was it damaged, capsized, or diverted?
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person
Lead #2What were the circumstances and condition of William Gross, the third sailor aboard? Was he experienced in ocean navigation?
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evidence
Lead #3Were any distress signals, debris, or wreckage from the vessel ever detected during the extensive search operations?
Frank William O'Brien, a 55-year-old sailor, disappeared on April 4, 2023, while sailing the 44-foot vessel S/V Ocean Bound with his wife Kerry and fellow sailor William Gross near Mazatlán, Mexico, en route to San Diego. The trio was last heard from on that date, and despite extensive search efforts in the area, no trace of the boat or occupants has been found. The circumstances of their disappearance remain unknown, and investigators continue seeking any information about their fate or the vessel's location.
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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 was the search focused near Mazatlán? Were there specific coordinates or navigation data from the vessel's last transmission?
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Even the smallest detail could be the key to solving this case.
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
Frank O'Brien, his wife Kerry, and sailor William Gross were last heard from aboard the 44-foot S/V Ocean Bound near Mazatlán, 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:May 26, 2026
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Any information, no matter how small, could be crucial to solving this case.
Phone: 9077868900
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Case Information
Incident:April 4, 2023
Last Updated:May 26, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 9077868900
You can remain anonymous