A 49-year-old man in Wisconsin is facing charges for allegedly running over a family and their dog with intent, resulting in the death of the mother and the dog, while injuring the father and the teenage son without causing life-threatening harm.

Authorities assert that the suspect, Jeffrey Endres, purposely targeted the juvenile, who was previously implicated in a “sensitive crime” against Endres’ minor child, as per court records acquired by Law&Crime. The details of this alleged crime remain under investigation.

Dr. Kami Ann Hansen, a well-known chiropractor in the area, died as a result of her injuries.

Once close neighbors living on the same street, the two families experienced a rift after accusations were levelled against the juvenile involving Endres’ child, straining their previously friendly relationship.

Endres, who was arrested following the crash and charged with one count of first-degree intentional homicide and two counts of attempted first-degree intentional homicide, was found dead in his jail cell Tuesday morning, two “trusted sources” reportedly confirmed to Madison NBC and CW affiliate WMTV. While Law&Crime has not been able to independently confirm Endres’ death, his name no longer appears on the list of inmates at the Dane County Jail, where he was being housed.

The crash

According to the criminal complaint, officers with the Cottage Grove Police Department at about 6:36 p.m. on April 28 responded to a reported crash involving “a single vehicle vs. multiple pedestrians” in the 1300 block of Landmark Drive.  Upon arriving, first responders said three pedestrians and a dog had been on the sidewalk when they were struck by a vehicle allegedly being driven by Endres.

Authorities said that Hansen was “thrown approximately 25-30 feet” from the spot of the collision. She was transported to the University of Wisconsin Hospital where she succumbed to her injuries and was pronounced dead. Hansen’s juvenile son suffered a “large laceration on his arm” and a concussion while her husband was able to escape with only minor injuries. The family’s dog was found dead at the scene, police said.

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The vehicle was overturned nearby and Endres allegedly remained at the scene until authorities arrived and confirmed that he was the driver. Asked about what happened, he allegedly said that he was “having a bad day” then offered only “no comment” about the crash.

Hansen’s husband, identified in court documents as PPH, described what happened to authorities. 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 saw the incident from her driveway said 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 allegedly said 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

Police said that in March 2025, allegations of a “sensitive crime” arose involving Hansen’s son and Endres’ juvenile child, after which, the two families had “no contact.”

Investigators in that case said 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 that police said appeared to show “the victimization of [Endes’] minor child” that resulted in a juvenile court proceeding taking place.

Endres received redacted copies of the police reports in connection with his child’s case “less than three hours” before the fatal crash, authorities said.

“[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,” the complaint states. “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].”

Prosecutors on Monday said that Endres was committing “an act of vigilante justice” during a court appearance, according to WMTV.

Endres was reportedly discovered unresponsive in his cell at about 6 a.m. Tuesday morning. He was pronounced dead after life-saving measures were unable to resuscitate him. His cause of death has not been revealed, but police said that after the fatal crash, he told hospital staff that he had been experiencing suicidal thoughts for about a month.