KPD Seeks Assistance Locating William “Billy” Sinclair
Published on June 06, 2026
LĪHU‘E – The Kauaʻi Police Department is asking for the public’s assistance in locating William “Billy” Sinclair, 51, of Kīlauea, who is wanted in connection with multiple ongoing investigations.
On June 6, 2026, at approximately 12:50 a.m., officers responded to a report of a suspicious death in Hanalei. During the course of the investigation, the victim's death was determined to be a homicide.
At approximately 4:45 a.m., officers were dispatched for reports of gunshots in the Kīlauea area. Through investigation it was later learned that a Kīlauea resident sustained minor injuries after being grazed by a bullet and was treated for non-life-threatening injuries.
Sinclair was subsequently identified as a person of interest in both investigations.
Officers received information that Sinclair may have been at a residence in the area. Kīlauea Road was temporarily closed and nearby residents were evacuated as officers searched the area. Despite search efforts, Sinclair was not located.
Sinclair is 5 feet 9 inches tall, medium build, with brown eyes and black hair. He is known to frequent the North Shore area of Kauaʻi.
Sinclair is considered armed and dangerous. Members of the public are advised not to approach him if seen and to contact law enforcement immediately.
Anyone with information regarding Sinclair’s whereabouts is urged to contact KPD Dispatch at (808) 241-1711. Members of the public who may have information related to the investigation are encouraged to contact Detective Caspillo at (808) 241-1680. To remain anonymous, contact Crime Stoppers Kaua‘i at (808) 246-8300, submit a tip at crimestopperskauai.org, or use the Crime Stoppers Kaua‘i P3 Tips Mobile App. Crime Stoppers Kaua‘i is a non-profit organization that offers cash rewards of up to $1,000 to anyone furnishing anonymous information that leads to an arrest.
This remains an active investigation, and no additional information is available at this time.
William “Billy” Sinclair, 51, of Kīlauea. If seen, do not approach and immediately contact KPD Dispatch at (808) 241-1711.
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