Cooper Ouellette, a 21-year-old man from Harwinton, begins trial this Thursday for the 2023 death of 17-year-old Sophie Ringquist. Ouellette faces charges of first-degree manslaughter and delivery of alcohol to a minor following a May 20 incident in which police allege he ran over Ringquist with his truck tire in Burlington, Connecticut.
At the center of the prosecution’s case is the use of Life360 location data and a chilling final text message, while the defense attempts to paint that same technology as fundamentally unreliable.
Digital evidence reveals Ringquist feared for her safety
The prosecution’s narrative is built on a trail of digital evidence. According to the arrest warrant detailed by CT Insider, investigators used Snapchat and text messages to reconstruct Sophie Ringquist’s state of mind during her final hours. One specific message stands out: at 11:25 p.m. on the night of the incident, Ringquist texted a friend saying, “I’m scared.”
The context surrounding that text is grim. Witnesses told state police that Ringquist and Ouellette, who were in an “on-again, off-again” relationship, had been arguing at a party in Terryville. Friends reported seeing Ouellette kick Ringquist and forcibly take her phone from her hand. When Ringquist tried to arrange a separate ride home, Ouellette allegedly blocked those efforts, and the two eventually left the party together in his truck, with police noting he was driving erratically.
The most harrowing allegation in the warrant describes a moment where Ringquist was filming a selfie video in the vehicle. Police allege the truck door opened and Ouellette suddenly stomped on the gas pedal, causing Ringquist to fall. The state believes Ouellette then ran over the teenager with a tire, dragged her back into the truck, and drove her to her residence. Once there, he allegedly repositioned her body and told her family she had fallen from the truck after getting sick from drinking.
The battle over Life360 reliability
While the text messages provide emotional weight, the Life360 data provides the spatial framework. The Connecticut State Police tasked the New England State Police Information Network with analyzing location data from both phones to create a forensic animation of the events. However, this is where the defense is digging in.
Defense attorneys argue that Life360 is too imprecise to be used as a speedometer or a definitive map of a crime. They pointed to a specific anomaly in the data where the phones appeared to be moving in reverse at speeds exceeding 250 mph—a physical impossibility that they claim proves the software is unreliable.
The state countered this by bringing in a witness who conducted a test drive, comparing Life360 data against a vehicle’s actual speedometer across more than 700 data points. Senior Assistant State’s Attorney David Clifton argued these results prove the data’s reliability. Superior Court Judge Chris Pelosi has ruled that the Life360 data is admissible and can be presented to the jury.
An underage party and a lost future
The manslaughter charge is accompanied by a felony charge for delivering alcohol to a minor. Police allege Ouellette arrived at the Terryville party with a Yeti cooler packed with liquor, beer, and alcoholic Arnold Palmer drinks. A receipt from a Bristol package store for $54.23 corroborated the purchase, and police later found a stash of Twisted Teas, Bud Light, and Coors Light in the bed of Ouellette’s truck.
The timing of the trial adds a layer of profound loss for the Ringquist family. The proceedings begin just weeks after what would have been Sophie’s 21st birthday. Born October 11, 2005, Ringquist was an ambitious student at Lewis Mills High School who was on track to graduate a semester early and had already begun taking college classes to study construction management.
Her family’s obituary shared a glimpse of her internal world through her journal entries, where she wrote of her desire to be remembered as “fierce” and her hope to be a “good person with pure intentions.”
National media will live-stream the trial
The case has transcended local news, drawing coverage from national outlets like People magazine and the New York Daily News. Because of this interest, the trial will be live-streamed by Court TV (now part of Law & Crime), turning a private family tragedy into a public examination of domestic volatility and digital surveillance.
If the defense can successfully argue that the Life360 data is unreliable, they may be able to challenge the state’s account of the incident where Ouellette suddenly stomped on the gas pedal.
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