Inset: David Nguyen (O”Fallon Police Department). Background: The house where Nguyen allegedly killed his mother in O’Fallon, Ill. (Google Maps).
An Illinois resident is currently incarcerated after allegedly murdering his mother and attempting to incinerate her home to conceal the crime, as reported by authorities in the Prairie State.
David Nguyen, aged 38, faces charges including murder with intent to kill or injure, as well as concealing a homicidal death, according to a statement from the O’Fallon Police Department.
The troubling situation came to light on December 27, 2025, when a welfare check led officers to a grim discovery at a two-story residence on Bossler Lane in O’Fallon, a quaint suburb of St. Louis in southern Illinois.
Family members had been unable to contact Terrie “Tracy” Nguyen, aged 72, prompting the police visit. Upon arrival, they found her body inside the home and immediately suspected foul play due to signs of violence, authorities noted.
Investigators quickly identified her son as a “person of interest” and began efforts to locate him, as detailed in the official release.
That afternoon, a vehicle associated with Nguyen was spotted heading west on Interstate 70 near Concordia, Missouri, approaching the Kansas City area. Around 4:30 p.m., state troopers from Missouri initiated a pursuit on the highway. The chase concluded when Nguyen’s gray Toyota Tacoma veered onto the shoulder and crashed in a wooded section, according to a video compilation from the Missouri State Highway Patrol documenting the chase and subsequent arrest.
The defendant was initially arrested on one count of felony fleeing and placed in the custody of the Lafayette County Sheriff’s Department pending extradition to St. Clair County, Illinois.
In Illinois, the more serious charges were filed by the St. Clair County State Attorney’s Office on New Year’s Eve 2025.
Prosecutors allege David Nguyen struck “Terrie Nguyen about the face and placed plastic wrap over her nose and mouth,” according to a charging document obtained by the Belleville News-Democrat.
The alleged killer then intended to hide his mother’s murder under a pile of smoldering ashes, according to law enforcement.
Prosecutors allege the son, “with knowledge that Terrie Nguyen had died by homicidal means, concealed the death of Terrie Nguyen by activating unlit gas burners on a stove to fill the house with gas and left a lit candle inside the house with the intent to cause an explosion.”
No motive has been provided as to why David Nguyen would have wanted his mother dead. And law enforcement is still unsure about how, exactly, the victim died.
“Her cause of death is undetermined,” O’Fallon Police Department Lt. Patrick Feldhake told the News-Democrat on Wednesday. “We haven’t got the autopsy report back yet.”
The victim worked at a nail salon in nearby Collinsville – another small city in Illinois that is part of the St. Louis metro area.
The woman, who went by “Tracy,” was memorialized on a series of social media posts in a local Collinsville Facebook group.
“Her impact on this community was huge probably more than they realize,” one of her former customers wrote. “She was always smiling always a kind word always willing to be there.”
