Ex-cop unintentionally fired bullet into neighbor's home, Algonquin police say

A former police officer was released on bond Wednesday after Algonquin police say he fired a bullet though his wall and into a neighbor’s home.

Mario P. Giannini Jr., 56, of the zero to 100 block of Kingsmill Court, Algonquin, is charged in McHenry County court with reckless discharge of a firearm. The felony offense typically carries a one- to three-year prison sentence.

Officers with the Algonquin Police Department arrested Giannini Tuesday, court records show.

According to a criminal complaint filed in the McHenry County Circuit Clerk’s Office, Giannini is accused of using his Smith & Wesson handgun to fire a single 9 mm bullet through the wall of his home Tuesday. The bullet then traveled through his neighbor’s garage wall and landed in the living room while the residents were home, according to the complaint.

Giannini did not report the situation to police or check to see whether anyone was injured, Algonquin Deputy Police Chief Ryan Markham said in an email Thursday.

The Cook County Sheriff’s Office confirmed that Giannini worked for the department as a deputy from March 1999 to January 2017. The officer went on to work for the Prairie Grove Police Department until he left voluntarily in February of this year, village officials confirmed.

It wasn’t immediately clear why Giannini fired the gun, Markham said.

“It appears as if the discharge was related to negligent and reckless handling of the weapon and he did not intend to fire it,” Markham said. “After the discharge of the weapon, Mr. Giannini did not check to see if anyone was injured nor did he contact the police to report the incident.”

An attempt to reach Giannini by phone Thursday was unsuccessful, and he had not yet hired a private attorney, records show.

At the time of his arrest, Giannini told investigating officers that he had been a police officer at one point, Markham said. Officers didn’t confirm the Giannini’s statement because they didn’t think it was significant to the investigation, Markham said, adding that Giannini has no association with the Algonquin Police Department.

Reached by phone Thursday, Co-Chief of the McHenry County State’s Attorney’s Office’s Criminal Division Dan Wilbrandt declined to comment on the case while it was pending.

Giannini indicated in a financial affidavit that he is retired, and receives $4,700 each month from a pension. He was released Wednesday morning from the McHenry County Jail in County Jail in Woodstock after posting 10% of his $10,000 bond, court records show.

Giannini is due back in court at 9 a.m. Sept. 30.