Joliet shooting: Fourth suspect charged after Holly Mathews, Jonathan Ceballos and Sergio Hernandez were killed and 11 injured at a Halloween party

WILL COUNTY, Ill. (WLS) — A fourth suspect is now charged, nearly three years after a deadly mass shooting at a suburban backyard Halloween party, the Will County Sheriff’s Office said Thursday.

The video in the player above is from a previous report.

The suspect, 21-year-old David Grijalva, was arrested at his workplace in Channahon on Thursday. He was charged in connection with a shooting at a Halloween party in Joliet Township that killed three people and injured 11 others in 2021.

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The shooting occurred around 12:39 a.m. on Oct. 31, 2021, at a Halloween party near East Jackson Street and Walnut Street in Joliet Township, police said. After the shooting, nearly 200 costumed partygoers were seen fleeing the area.

Additional police officers arrived and saw several people who had been shot in the backyard and surrounding houses. While first responders treated the wounded, more shots were heard, police said.

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Two victims, 22-year-old Holly Mathews and 22-year-old Jonathan Ceballos, were pronounced dead at the scene. The actual target, Sergio Hernandez, was paralyzed in the shooting and died from his injuries nearly a year later, authorities said.

At least 11 other people were injured in the incident.

Grijalva is currently facing 18 criminal charges, including first-degree murder, the Will County Sheriff’s Office said.

Three other people were previously charged in connection with the shooting: Joskar S. Ramos, 18, of Joliet; Thomas Lopez, 21, of Joliet; and Jeremy Lopez, 19, of Lockport Township.

“This was a true team effort from everyone at the Will County Sheriff’s Office who helped play a role in this investigation,” Sheriff Mike Kelley said in a news release. “This tragic incident could not have been resolved without the public’s help, so I would like to thank those who provided me with information. Every member of the Will County Sheriff’s Office Criminal Investigation Division has worked tirelessly for months to help bring these criminals to justice. Now that these criminals are behind bars, Will County is now safer than it was the day before. These words were true then, and they are true today. The fourth suspect, David A. Grijalva, will now be held accountable for his alleged actions that October night.”

Grijalva remains in custody at the Will County Adult Detention Center until his next court appearance.