Grand Jury Returns Indictment Against William Sinclair

Published on June 17, 2026

Lihue, Kauaʻi – Prosecuting Attorney Rebecca Like announced today that a Kauaʻi grand jury has returned an indictment charging William Robert Sinclair, 51, of Kilauea with 28 counts.

Those charges include the following:

Murder in the Second Degree
2 Counts of Carrying or Use of Firearm in the Commission of a Separate Felony
Attempted Murder in the Second Degree
21 Counts of Ownership or Possession Prohibited
3 Counts of Possession of Prohibited Firearm or Silencer

The Indictment alleges that on or about June 5, 2026, Sinclair did intentionally or knowingly cause the death of Sergio Reyes Hernandez. It further alleges that on or about June 6, 2026, Sinclair engaged in conduct which under the circumstances as he believed them to be constituted a substantial step in a course of conduct intended to cause the death of another individual.

The Indictment also charges Sinclair with possessing 20 firearms, 3 suppressors and ammunition that he is prohibited from possessing as a person who has been convicted of having committed a felony.

The Indictment also subjects Sinclair to possible extended sentencing as a multiple offender.

The Honorable Chief Judge Michael Soong issued a No Bail Warrant at the State’s request following today’s grand jury proceeding. Sinclair has been served with the warrant, and his arraignment will be heard tomorrow morning at 8:00 a.m. in courtroom 4 in front of Judge Soong.

An Indictment is merely an accusation and all defendants are presumed innocent unless and until proven guilty beyond a reasonable doubt in a court of law.

This indictment is the result of the tireless efforts of the Kauaʻi Police Department and the invaluable assistance of our law enforcement partners. We are grateful for the professionalism, persistence, and collaboration that brought this investigation to this stage. While today's action marks a significant milestone, the matter will now proceed through the judicial process, where the facts will be presented in court and the defendant's constitutional rights will be protected. Our office remains committed to seeking justice, enhancing public safety, and maintaining the public's trust in the integrity of our criminal justice system.