Joseph D. Johnson charged with murder in Garnsey Avenue shooting deaths of Joselynn Diaz-Garcia, son in Joliet: police

A tragic incident unfolded over the weekend in Joliet, Illinois, as a 29-year-old local man faces murder charges in the deaths of a mother and her young child. Authorities announced these developments on Wednesday.

Joseph D. Johnson has been formally accused of first-degree murder following the fatal shootings of Joselynn Diaz-Garcia and her 4-year-old son, which occurred on Sunday, according to police reports.

ABC7 Chicago is now streaming 24/7. Click here to watch

Currently, Johnson is under police supervision at Loyola Medical Center in Maywood as he receives medical treatment, as per statements from the Joliet police.

Upon his release from the hospital, he will be transferred to Will County Jail to await further legal proceedings.

The Joliet police department received emergency calls at approximately 6:55 a.m. on Sunday morning, alerting them to gunfire near the intersection of Cleveland and Dillman avenues. Witnesses reported seeing a shirtless man firing a gun while running alongside train tracks.

Officers swiftly responded to the situation, arriving at a residence located in the 700 block of Garnsey Avenue on the city’s east side to investigate the incident.

There, officers found a 29-year-old man who had suffered an apparent self-inflicted gunshot wound to his ankle, police said.

Outside the home, officers found the 4-year-old boy and his mother, a 36-year-old woman, unresponsive near the backyard. Both victims suffered apparent gunshot wounds and were pronounced dead on the scene.

Officers also found an unharmed 8-year-old boy, who has special needs, in a bedroom. The boy, who is also the 36-year-old woman’s child, was taken to a local hospital as a precaution.

A motive for the shooting was not immediately clear, but police said it appears that the person of interest and the victims had some kind of domestic relationship.

Police said the 29-year-old is believed to be a part-time resident of the home, and he is not believed to be the father of the two boys.

“On behalf of the Joliet Police Department, I extend our deepest condolences to the family and to everyone in our community who is touched by this awful and unnecessary act of violence. I am incredibly proud of our officers, detectives, and dispatchers who acted swiftly and professionally under heartbreaking circumstances. We will continue to seek justice while surrounding this family and our city with compassion and support,” Joliet Police Chief Bill Evans said.

Joliet police continue to investigate the double fatal shooting.

Anyone with video footage or information related to the incident is encouraged to call the Joliet Police Department Investigation Division at 815-724-3020, or contact Will County Crime Stoppers at 800-323-6734 or online at to remain anonymous.

Copyright © 2026 WLS-TV. All Rights Reserved.

You May Also Like

Pinkerton: Pope Leo Attacks the Root of Left-Wing Radicalism in France

Pinkerton: Pope Leo Targets the Roots of Left-Wing Radicalism in France

A brief act of remembrance carried significant historical, moral and political weight.…
Presidents Cup 2026 Sunday: Rally, protest planned, security heightened with Donald Trump expected at Chicago O'Hare Airport

Expected Trump Visit Brings Protest, Security to Presidents Cup

CHICAGO — President Donald Trump is expected to land at Chicago’s O’Hare…
Violent nor'easter hammers NYC region, leaving one dead in carnage

Deadly Nor’easter Slams NYC Region, Leaving One Dead in Its Wake

A powerful nor’easter battered New York City and the surrounding region Saturday…
Accused Colombian drug kingpin extradited to California to face drug charges

Accused Colombian Drug Kingpin Extradited to California Court

A Colombian alleged narco-terrorism leader accused of commanding an armed force of…
New giant pandas from China arrive in Atlanta zoo

Giant Pandas From China Arrive at Zoo Atlanta to Big Cheers

Two giant pandas from China have arrived in the United States under…
How Texas Gov. Abbott's race predicts 2026 'whipeout' for GOP: Begala

Former Clinton Adviser Paul Begala: Abbott’s Texas Race Foreshadows 2026 GOP ‘Wipeout’

Democratic strategist Paul Begala is forecasting a Republican “wipeout” in the 2026…
Hurricane Polo barrels toward Mexico as SoCal braces for dangerous surf, flooding

Hurricane Polo Nears Mexico as Southern California Braces for Dangerous Surf and Flooding

A powerful hurricane is racing toward Mexico while Southern California prepares for…
Chicago shooting: Vigil marks 3 years since 27-year-old Adam Moreno fatally shot in Brighton Park, family renews call for justice

Family seeks justice at 3-year vigil for Chicago’s Adam Moreno

CHICAGO — Three years after 27-year-old Adam Moreno was shot and killed…
Pope Leo draws staggering 800,000 faithful to heart of Paris for massive outdoor Mass

Pope Leo Draws 800,000 Faithful to Outdoor Mass in Central Paris

Pope Leo XIV drew an estimated 800,000 people to central Paris on…
‘SNL’ roasts Mayor Zohran Mamdani with ‘urgent message’ for New Yorkers during nor’easter

SNL Roasts NYC Mayor Zohran Mamdani With ‘Urgent Message’ During Nor’easter

Mayor Zohran Mamdani became the target of “Saturday Night Live” comedy during…
Video shows gunman open fire at South LA assisted living facility

Video Shows Gunman Opening Fire at South Los Angeles Assisted Living Facility

Surveillance footage captured the moment a suspected gunman allegedly opened fire on…
Trump’s next AI czar: Who’s in the running for the White House post

Trump’s Next White House AI Czar: Who’s in the Running?

President Trump’s next artificial intelligence adviser will enter a rapidly transforming technology…