Ettore Lacchei, 79, of Antioch.

Police say a 79-year-old man has been charged with murder for allegedly fatally shooting his neighbor, who was performing yard work, in the head near Antioch.

The Lake County Sheriff’s Office and Antioch Fire Department responded around 7:35 p.m. on April 12 to the 40700 block of North Black Oak Avenue in unincorporated Antioch.

Paramedics were already on the scene performing lifesaving measures before sheriff’s deputies arrived, Lake County Sheriff’s Office Deputy Chief Christopher Covelli said.

The initial 911 call reported that a man was unresponsive on the driveway.

The victim was later identified as William Martys, 59, who lived at the residence.

Martys was transported to Advocate Condell Medical Center in Libertyville where he was pronounced dead, Covelli said.

Covelli said a further investigation revealed Martys sustained a gunshot wound to the head.

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Detectives conducted a comprehensive investigation into the murder, Covelli said in an update Tuesday.

Sheriff’s detectives determined Martys’ next-door neighbor, Ettore Lacchei, 79, had “various perceived grievances” with Martys, Covelli said.

Martys was using a leaf blower in his yard when he was approached by Lacchei.

Lacchei argued with Martys and Lacchei shot Martys in the head during the argument, Covelli said.

Sheriff’s detectives recovered the firearm believed to have been used in the murder near Lacchei’s property line.

Lacchei was arrested without incident Tuesday at his home following a search warrant.

The Lake County State’s Attorney’s Office reviewed the case and approved two counts of first-degree murder.

“Our condolences go out to the family and friends of William Martys, who was senselessly murdered. The members of the sheriff’s office are relentless when it comes to seeking justice for victims. The members of our Criminal Investigations Division have been working around the clock to bring Mr. Martys’ murderer to justice, and I am happy Mr. Martys’ family can begin the closure and healing process,” Lake County Sheriff John Idleburg said.

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Lacchei remains held in the Lake County Jail pending an initial court hearing.

Lake County State’s Attorney Eric Rinehart said he is proud of the work of the sheriff’s office along with First Assistant State’s Attorney Lauren Callinan and Chief of Criminal Jeffrey Facklam, who worked closely with detectives on the investigation.

“Once again, easy access to firearms has turned a dispute into a deadly crime. We will support the victims and seek justice in the court rooms,” Rinehart said.

The Lake County Sheriff’s Office was assisted by the Antioch Police Department and Lake County Major Crime Task Force in the investigation.