The person at the center of this case
Robert W Gilsey
Missing Person · Open
19 years waiting · since 2006
Missing Person: Robert W Gilsey
Justice for Robert W Gilsey — the trail went cold in 2006, but the truth hasn't.
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Key leads to think about
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vehicle
Lead #1Why was the power boat's engine running with the throttle open when discovered? Was this consistent with an accident or deliberate action?
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location
Lead #2What circumstances led Robert to take the power boat from Diamond Cove Marina on October 6, 2006?
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evidence
Lead #3Were there any signs of struggle or foul play aboard the vessel, or evidence suggesting accidental circumstances?
Robert W Gilsey, a 57-year-old man living aboard a sailboat at Diamond Cove Marina in Portland, Maine, disappeared on October 6, 2006. His power boat was discovered off Cape Elizabeth with the engine running, throttle open, and fuel depleted—circumstances suggesting a possible accident or foul play. Despite investigation by Maine Marine Patrol, his fate remains unknown and anyone with information about his disappearance is urged to come forward.
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Official wording
Source Narrative
NamUs case MP53360. Missing person: Robert W Gilsey.
Last known contact: 2006-10-06 in Portland, Cumberland, ME. Circumstances: Robert lived on a sailboat moored at Diamond Cove Marina.
His power boat was found off Cape Elizabeth without him on board. The engine was on, the throttle was open, and it had run out of gas.
Demographics: 57 years, Male, White / Caucasian. Physical description: 6 ft 0 in, 185 lbs, hair: Gray or Partially Gray, eyes: Blue.
Clothing and accessories: Clothing: Green long-sleeved windbreaker, possibly brown shorts.. Investigating agency: Maine Marine Patrol - Augusta Headquarters | 06-1006 | 2006-10-10.
Timeline of Events
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2006-10-06
Last known contact
Robert W Gilsey last known to be in Portland, Cumberland, ME
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2006-10-06
Boat discovery
Power boat found off Cape Elizabeth with engine running, throttle open, and out of gas
Key Locations
Interactive map showing important locations related to this case
Case Information
Incident:October 6, 2006
Last Updated:August 23, 2026
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Phone: 2076339595
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Case Information
Incident:October 6, 2006
Last Updated:August 23, 2026
Have Information?
Any information, no matter how small, could be crucial to solving this case.
Phone: 2076339595
You can remain anonymous