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A visitor on a snorkeling charter off the Kona coast in southern Hawaii is accused of attacking the boat’s captain during a midday excursion, leaving the captain injured and prompting an onboard detention and arrest when the vessel returned to shore. The case is now in police custody and will proceed to court early next week.
What investigators say happened
Hawaii police say the incident unfolded Thursday afternoon while the group was on a scheduled three-hour snorkel trip near Kailua-Kona. At some point during the outing, officers allege the passenger attacked the 62-year-old captain with a fillet knife, inflicting wounds to the head, hands and lower abdomen.
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Other passengers intervened and physically restrained the suspect until the boat arrived back at Honokōhau Harbor, where responding patrol units took the man into custody shortly after the vessel docked. Emergency responders transported the captain to a local hospital; police describe his condition as stable.
| Detail | Information |
|---|---|
| Suspect | Avery Nissen, 21 (from eastern Kansas) |
| Charges | Second-degree attempted murder; first- and second-degree assault |
| Bail | $1,570,000 |
| Victim | 62-year-old boat captain — hospitalized, stable |
| Location | Kailua-Kona / Honokōhau Harbor, Hawaii Island |
| Reported police response time | About 3:21 p.m., when the vessel returned to harbor |
Legal status and next steps
Nissen has been booked on multiple counts, including an attempted murder charge, and is being held on the high bail amount set by prosecutors. He is expected to appear in Kona District Court on Monday to face the formal charges.
Police have not publicly identified a motive. Detectives are continuing their investigation and have asked anyone with relevant information to contact law enforcement.
Context and implications
Violent incidents on small commercial vessels are rare, but this case highlights operational and safety questions for tour operators and passengers alike. How boat crews screen passengers, manage onboard conflicts and ensure quick access to help are all likely to come under scrutiny as the investigation proceeds.
- For passengers: Be aware of emergency procedures and where safety equipment is stored.
- For operators: Consider reviewing crew training on de-escalation and restraint techniques.
- For the public: Expect follow-up from local authorities as they piece together the timeline and motive.
Authorities say updates will be released as new details become available. The case remains active and is being handled by Hawaii police investigators and local prosecutors.
