Jeffrey Endres, 49, mowed down and killed neighbor Dr Kami Hansen as she walked with her husband Paul and son in Cottage Grove, Wisconsin, on April 28

Endres child was said to have been targeted by Dr. Hansen’s son in what investigators have called a ‘sensitive crime’ that was discovered in March

Distraught after the alleged crime, Endres allegedly had been aiming to strike the suspected perpetrator, but he ended up mowing down the mom after accelerating to 40mph

Force of the impact threw the popular chiropractor 30 feet into the air, knocked the shoes off her feet and also killed the family’s pet pit bull

The victim’s husband Paul Hansen and son were both injured, but survived the crash witnessed by one of the Hansen’s other children watching from their front yard

Endres, arrested and held on a $1 million bond was due back in court on May 14, for a preliminary hearing – he was facing life in prison if he had been convicted  

Accused of a shocking act of vigilante justice after allegedly plowing into his neighbors as they were on an evening walk, killing the family’s mother and dog. Jeffrey Endres, [photo], was charged with first-degree homicide. He was found dead in his cell, Tuesday morning 

A Wisconsin man who willfully ran over his doctor neighbor was found dead in his cell on Tuesday Morning. Jeffrey Endres, 49, faced first-degree homicide after killing the neighbor whose son was accused of ‘sensitive crime’ against his child in what has been tagged ‘vigilante justice.
Dr. Kami Hansen, a renowned chiropractor at Heartland Family Chiropractic was killed, on April 28 when her neighbor Jeffrey Endres, mowed her down as she walked with her husband Paul and one of the couple’s three sons in Cottage Grove, a suburb of Madison.
Without releasing details of the crime, police said Endres child was been targeted by Hansen’s son in what investigators have called a ‘sensitive crime’ that was discovered in March.
Hansen and Endres were neighbors and the two families were close until one of Hansen’s sons was accused of a ‘sensitive crime’ against one of Endres’ children.
The child accused of the sensitive crime was walking with his parents at the time of Endres’ vigilante act and was the intended target of the 40mph car attack, investigators say.  

Kami Hansen was a renowned chiropractor at Heartland Family Chiropractic was killed along with the family dog after her after her neighbor plowed into her family as they were on an evening walk

According to the criminal complaint, Hansen’s widower Paul told investigators that their families had been close friends up until March 2025, when his son was ‘accused of a sensitive crime’ against Endres’ child. 
Officers were reportedly looking through students’ phones at a school for an unrelated investigation when they found ‘several videos’ that ‘appeared to be the victimization of (Endres’) minor child’, the filing stated. 
Endres was reportedly distraught by the alleged crime and is said to have been aiming to strike the suspected perpetrator. But he ended up mowing down Kami Hansen while doing 40mph.
The force of the impact threw the popular chiropractor 30 feet into the air, knocked the shoes off her feet and also killed the family’s pet pit bull.  
Her husband Paul Hansen husband and their son though injured, both survived. The crash was witnessed by another Hansen child who watched the horror of his parents and sibling’s vehicular unfold from their front yard.
Jeffery Endres himself was badly injured in the crash and arrested. However, a day following his first court appearance on murder charges Monday, the suspect was found dead in his jail cell Tuesday. 

Witnesses said Endres accelerated his car and ‘jerked’ sideways into the family at over 40mph, killing Hansen and severely injuring her son. An Uber driver said he initially feared Endres was going to rear-end him at high speed, before he ‘jerked’ to the side and mounted the curb   

Endres made his first appearance in court Monday and appeared at Dane County Court where he was charged with first-degree homicide and two counts of attempted first-degree homicide. His bond was set at $1 million.
But Endres was found dead in his cell at Dane County Jail around 6am the following morning.
No cause of death has been given and the investigation into how Endres died is ongoing.  

Kami Hansen [photo], was killed when neighbor Jeffrey Endres allegedly accelerated into her and her family on April 28, which prosecutors said was the result of him discovering her son was accused by cops of ‘victimizing’ his child 

Paul Hansen told officers that their children were on the same gymnastics team and they often carpooled to practices and meets together, and that their children ‘were considered best friends.’ 
However, that friendship imploded as the March allegation of a ‘sensitive crime’ against one of the Hansen children also led to a ‘no contact’ order between the families. 
Appearing in a Zoom court hearing on March 28, a ‘distraught’ Endres asked the court to keep Hansen’s son away from their neighborhood, but a judge allowed him to return home, per the filing. 
In a related development five days before the Hansen family was hit by a car Endres opened a records request with the Cottage Grove Police on April 23, for a copy of his child’s case report.
He was given this report just hours before the horror crash. ‘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,’ the complaint stated. 
Hours later, Endres after spotting Dr. Hansen out on a walk with her husband and son around 6:30pm, accelerated and slammed his car into the Hansens, in what prosecutors described in court as ‘essentially an act of vigilante justice.’ 

Paul Hansen [right], told investigators that the families were close and their children were ‘considered best friends’, until one of Hansen’s sons was accused by police in March 2025, setting up the tragic chain of events that has shattered both families

Paul Hansen’s told police he heard the vehicle “flooring it” in their direction before it drove over a curb, straight into his family.
Multiple witnesses told cops the car accelerated and ‘jerked’ sideways into the family at over 40mph.
An Uber driver who witnessed the collision told cops that he initially feared Endres was going to rear-end him at high speed, before he ‘jerked’ to the side and mounted the curb. 
‘If he’s telling you he veered off the roadway, then he’s lying to you,’ the witness said, per WMTV15. ‘I saw that vehicle jerk.’ Dr Hansen was killed while her son sustained severe injuries.
Endres, according to the criminal complaint, remained at the scene after hitting the family, and told officers he was ‘having a bad day’ and had ‘no comment’ on the crash. 
The errant driver later claimed that he’d lost control of his vehicle going at 25 mph as he was driving to the gas station. By contrast, witnesses told police his car was going at speeds of over 40mph. 
Kami Hansen was rushed to hospital where she died from her injuries hours later. Her son required emergency surgery as he suffered injuries across his body and a concussion. Paul Hansen sustained cuts to his leg.
The family’s black pit bull died at the scene. 
Endres was arrested and held on a $1 million bond. Endres was due back in court on May 14, for a preliminary hearing. He was facing life in prison if he had been convicted as charged. 
The image in his mugshot shows Endres badly bruised and wearing a neck brace. He was conscious after the crash and there is no suggestion that the injuries he sustained in the crash are the direct cause of his death in custody.