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 S/V Ocean Bound? Why was no wreckage or debris recovered despite extensive searches?
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person
Lead #2What were the circumstances that led to the disappearance of all three people aboard the vessel?
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witness
Lead #3Were there any other vessels or maritime traffic in the area on April 4, 2023 that may have observed the Ocean Bound?
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 despite extensive search efforts in the area. The circumstances of their disappearance remain unknown, and any information about the boat's location or the fate of those aboard could be crucial to resolving this case.
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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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clue
Lead #4Why was the last known contact on April 4, 2023 near Mazatlan, and what was the expected timeline to reach San Diego?
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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
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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 Mazatlan, Mexico while sailing to San Diego.
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:April 4, 2023
Last Updated:June 30, 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:June 30, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 9077868900
You can remain anonymous