Authorities say a mother’s phone call on March 20 led deputies to a teenager’s body and a fast-moving criminal case.
TURTLE, Wis. — What began as a welfare check at a home on East Gorton Street quickly became a homicide case after Rock County authorities say a 41-year-old woman told dispatchers she had killed her teenage daughter the night before.
The pace of the case is one reason it has drawn close attention. In a matter of days, deputies had responded, identified a suspect, announced an arrest and watched the case move into Rock County court. But the speed of the official timeline also leaves gaps. Public filings and reports describe key moments on March 20, the evidence found in the home and the defendant’s first court appearance. They still leave many of the private hours before dawn known only to investigators, the accused and the dead girl, Kuren Rein, 14.
The known timeline starts with the call. According to the complaint described in local reporting, Tyiece Oninski phoned the Rock County Communications Center’s non-emergency line on the morning of March 20 and said she had “murdered” her daughter the previous night. The conversation lasted about 13 minutes. At one point, dispatchers asked whether an ambulance should be sent. Oninski replied that the child was dead and needed a hearse, according to the complaint. She also said she had tried to take her own life after the killing. Deputies were then sent to the residence in the 2000 block of East Gorton Street. The sheriff’s office later said officers arrived around 8 a.m. and found a 14-year-old dead inside. On March 23, the sheriff’s office publicly identified Oninski, of Beloit, as the arrested suspect.
From there, the timeline shifts from call records to the physical scene. Reports on the complaint said Rein was found face down in a large pool of blood. A black pocket knife and an empty leather sheath were located near her body. Authorities also documented injuries on Oninski, including a deep cut to the neck and cuts to the wrists, and one local account added a wound near the temple. Investigators processing the house said they observed a partial barefoot print and red staining on the bottom of Oninski’s left foot. Later, the Rock County Medical Examiner’s Department determined that Rein died of deep incised wounds to the right side of her neck. Reports said there were no defensive wounds. Together, those details formed the first public reconstruction of what prosecutors say happened inside the home.
The next turn in the timeline came from statements attributed to Oninski during and after the response. Prosecutors say she told dispatchers she killed the girl to protect her from somebody else and later specified Elon Musk. Public reporting has not pointed to evidence that any outside threat existed. After being taken first to Beloit Memorial Hospital and then to Madison for treatment, she tested positive for benzodiazepines, amphetamines and THC, according to local reports on the complaint. Another reported detail added to the unusual public narrative: while hospitalized, Oninski allegedly asked whether her name had reached the news and was disappointed when told it had not. Those details may matter later, but at this stage they stand mainly as allegations in support of the charge.
Only after the timeline of the crime and arrest became public did the broader setting come into clearer view. Rein was identified as a freshman at Beloit Memorial High School. Family members said she is survived by an older brother, and a fundraiser was started for funeral expenses. A man described in one report as the homeowner and a grandfather figure told deputies he believed the teen had gone to school and said his bedroom was separate from where Rein and Oninski were sleeping. That account suggests investigators were piecing together not just a killing, but the ordinary household routines around it: who woke when, who heard what, and how long the violence remained undiscovered by others in the home.
The final phase of the public timeline so far is the courtroom. Oninski was charged with first-degree intentional homicide, appeared in Rock County court and was ordered held on a $1 million cash bond, according to reports published March 30 and March 31. Coverage at the time listed April 14 as the next hearing date. A conviction on the charge could bring life in prison. Yet the record available in public reporting reviewed for this article does not fully carry the story past that hearing setting. So the case remains, in public view, a sharply defined timeline with an incomplete ending: confession call, welfare check, death investigation, arrest, charge, bond and an unresolved path ahead in court.
That is where the story stood on April 19 — a minute-by-minute case file up front, a fuller explanation still to come, and a teenager’s death at the center of both.
Author note: Last updated April 19, 2026.