A 49-year-old Wisconsin man was charged with intentionally running over a juvenile and his parents while the family was out walking their dog, killing the mother and dog but leaving the teenage boy and his father with non-life-threatening injuries.
According to court documents obtained by Law&Crime, authorities believe that the defendant, Jeffrey Endres, intended to kill the juvenile victim, who was recently charged with the “victimization” of Endres’ minor child in what police described as a “sensitive crime” that is still being investigated.
Dr. Kami Ann Hansen, a prominent chiropractor in the area, died as a result of her injuries.
The two families live on the same street and were reportedly close friends before falling out over allegations against the juvenile victim involving Endres’ child.
Endres, who was arrested after the crash and charged with one count of first-degree intentional homicide and two counts of attempted first-degree intentional homicide, was discovered dead in his jail cell on Tuesday morning, according to two “trusted sources” who spoke with Madison NBC and CW affiliate WMTV. While Law&Crime has been unable to independently confirm Endres’ death, his name is no longer listed on the Dane County Jail’s inmate roster.
According to the criminal complaint, at approximately 6:36 p.m. on April 28, officers from the Cottage Grove Police Department responded to a reported crash involving “a single vehicle vs. multiple pedestrians” in the 1300 block of Landmark Drive. When first responders arrived, they reported that three pedestrians and a dog had been struck on the sidewalk by a vehicle allegedly driven by Endres.
The crash
According to authorities, Hansen was “thrown approximately 25-30 feet” from the scene of the collision. She was transported to the University of Wisconsin Hospital, where she died from her injuries. Hansen’s young son sustained a “large laceration on his arm” and a concussion, while her husband escaped with only minor injuries. According to police, the family’s dog died at the scene.
The vehicle overturned nearby, and Endres allegedly remained at the scene until authorities arrived and confirmed his identity as the driver. When asked about what happened, he allegedly stated that he was “having a bad day” and had “no comment” about the crash.
Hansen’s husband, identified in court documents as PPH, told authorities what happened. Per the complaint:
PPH stated that as they were walking, he heard a vehicle accelerating and he looked up to see the grey Chevrolet Traverse “flooring it” in their direction. PPH stated he watched the vehicle accelerate and drive over the curb directly at the family.
PPH stated the vehicle drove “straight into us.” PPH stated it appeared the vehicle was accelerating as it hit the curb, and it went flying over the curb “like he never hit the brakes.” PPH stated that his leg was grazed by the vehicle, and he ended up on the ground. PPH stated that when he looked up, he observed his son, Juvenile Victim 1, lying near the road moaning in pain.
PPH stated that another one of his children, Juvenile Victim 2, observed the entire incident from the backyard of the family’s home across the street. PPH stated that Juvenile Victim 2 ran over to PPH and said, “he tried to hit you.” PPH estimated the speed of the vehicle to be at least 40 miles per hour.
PPH reports that he recognized the vehicle that had hit them and observed “Jeff” crawling out of the vehicle after the crash. PPH stated to Det. Carter on May 2, 2025 that “Jeff” was a neighbor that was a close friend of the family until recently. PPH stated “I’m confident he was intentionally trying to kill us or [Juvenile Victim 1] at least.”
Another witness who witnessed the incident from her driveway stated that Endres was “absolutely flying” down the street, which has a 25 mph speed limit, before striking the family, all of whom she confirmed were on the sidewalk.
An Uber driver in the area also claimed that Endres appeared to be targeting the family.
“If he’s telling you he veered off the roadway, then he’s lying to you,” the driver allegedly told police, adding that Endres’ vehicle went “straight into them,” referring to the victims.
Alleged motive
According to police, in March 2025, allegations of a “sensitive crime” involving Hansen’s son and Endres’ juvenile child surfaced, and the two families had “no contact.”
Investigators in that case stated that they were “in the process of examining numerous cell phones of students at a local middle school” when several videos were discovered on Hansen’s son’s phone, which police said appeared to show “the victimization of [Endes’] minor child,” prompting a juvenile court proceeding.
Endres received redacted copies of police reports related to his child’s case “less than three hours” before the fatal crash, according to authorities.
“[I]t was clear that [Endres] was aware of the identity of [Hansen’s son] and knew him to be the suspect in the victimization of his minor child,” according to the complaint. “The reports provided by the Village of Cottage Grove Police to the defendant contained detailed descriptions of videos purporting to show the victimization of the defendant’s minor child by [Hansen’s son].”
According to WMTV, prosecutors claimed on Monday that Endres was committing “an act of vigilante justice” during his court appearance.
Endres was reportedly discovered unresponsive in his cell around 6 a.m. on Tuesday. He was pronounced dead after life-saving measures proved ineffective. His cause of death has yet to be determined, but police say he told hospital staff after the fatal crash that he had been having suicidal thoughts for about a month.