The manslaughter trial of Cooper Ouellette has opened in Connecticut, with a medical examiner and a police collision investigator giving differing evidence about how his 17-year-old girlfriend, Sophie, suffered fatal injuries in May 2023.
Ouellette, now 21, is charged with first-degree manslaughter and delivering alcohol to a minor. He has pleaded not guilty. Proceedings began at New Britain Superior Court on Thursday 29 October 2026, with testimony continuing on Friday.
What the court has heard
The case concerns the journey home from a party in Terryville on the night of 20 May 2023. Sophie was travelling in Ouellette’s pickup truck. She was later brought to her family home with serious injuries, and her parents took her to hospital, where she died.
Prosecutors allege that the couple had argued at the party and that Sophie became separated from the moving truck on two occasions. Their case is that Ouellette’s driving caused her injuries, including injuries they say resulted from the vehicle running over her.
The defence disputes that account. In a police interview played to jurors, Ouellette said Sophie had wanted to be sick and had jumped out before he could pull over. The fact that he made that statement is documented; whether his account is accurate is for the jury to assess.
Medical examiner and collision investigator differ
On Friday 30 October, associate medical examiner Dr Gregory Vincent testified that Sophie’s injuries were consistent with a fall from a moving vehicle followed by crushing injuries caused by a tyre. He told the court that the most serious chest injuries could not be explained by a fall alone, according to Connecticut Post’s courtroom report.
State police collision investigator Spencer Bronson, however, said his scene investigation had not produced physical evidence establishing that the truck struck or ran over Sophie. He acknowledged that such evidence would not always be expected to remain. His testimony did not rule out the medical examiner’s interpretation, but it highlighted a limitation in the physical reconstruction.
A medical examiner’s classification of a death as homicide describes the medical circumstances of death. It does not by itself establish that a particular defendant is criminally guilty.
Digital evidence and the Life360 dispute
Investigators have examined mobile-phone messages, video, surveillance recordings and data from the Life360 location-sharing app. Police used some of that material in attempting to reconstruct the truck’s movements and the chronology of the night.
Ouellette’s lawyers challenged the precision and reliability of the Life360 data, pointing to implausible speed readings and a gap in the records. Prosecutors argued the wider body of evidence helped corroborate their reconstruction. On 9 October, Judge Chris Pelosi ruled that the location data could be presented to the jury. The ruling on admissibility does not mean every estimate based on the data has been proved accurate. CT Insider reported the pre-trial ruling.
What the CCTV shows and does not show
A video published by Courtroom Insider on 30 October 2026 presents nighttime security-camera footage said to show Ouellette’s truck arriving at Sophie’s home after the incident. The recording is distressing and should not be confused with footage of the earlier events on the road.
The footage is relevant to the return home, but it does not independently establish exactly how Sophie left the moving truck or whether a tyre struck her. Those questions remain disputed in the trial.
Video: Courtroom Insider. Contains potentially distressing footage. The video publisher identifies it as security-camera footage from the night of Sophie’s injuries.
What we know
- The trial began on 29 October 2026 in New Britain, Connecticut.
- Ouellette faces a first-degree manslaughter charge and a charge of delivering alcohol to a minor, and has entered a not-guilty plea.
- Sophie was 17 when she died after the May 2023 incident.
- The jury has heard testimony from family members, police and the medical examiner, as well as evidence concerning mobile phones and video.
What we do not know
No verdict has been reached. The precise circumstances in which Sophie left the truck, the extent to which different digital records can establish speed and location, and the defendant’s criminal responsibility are matters for the jury.
Courtroom Insider reports that Judge Pelosi instructed courtroom participants and media covering the trial not to use Sophie’s surname because she was a minor at the time. Fish 4 News is referring to her by her first name in this report.
Sources
- Connecticut Post: medical examiner and police investigator testimony, 30 October 2026
- Court TV: charges, opening trial and competing accounts, 29-30 October 2026
- Court TV: police body-camera testimony, 30 October 2026
- CT Insider: Life360 admissibility ruling, 9 October 2026
- Courtroom Insider: day two courtroom updates and identification guidance, 30 October 2026
