Update 5/30/23 – Van Duyn has been sentenced to 28 years in prison for killing Arnold-Boesigner and leaving her body in a unit at a U-Haul facility in Roscoe, Illinois. He pled guilty to murder in court on Friday. The sentence also includes three years of mandatory supervised release, a source reported.

Van Duyn is also serving a seven-year prison sentence in Wisconsin for kidnapping his daughter.

Arnold-Boesiger was last seen in November 2020. At the time, she and Van Duyn were living together in Wisconsin. Arnold-Boesigner received an order of protection against Van Duyn in 2019. In the petition, she said Van Duyn was stealing her prescription medication. In a domestic-violence incident in July 2019, she claimed Van Duyn bit her lips to keep her from yelling at him and strangled her until she nearly passed out. Arnold-Boesigner told the court that she feared for her safety since reporting the incident.

Van Duyn was charged in December 2019 with aggravated domestic battery by strangulation, two counts of domestic battery and one count of criminal damage to property. The case was later dismissed, a source reported.

8/11/21 – Police have arrested a suspect for the murder of Arnold-Boesigner, whose body was found inside a unit rented in her name in March. Jonathan Van Duyn, 33, has been charged with first-degree murder and faces the additional charge of concealment of a homicidal death, according to a source.

Police discovered the body inside a black Jeep Renegade registered to Van Duyn, which was stored inside the unit. The cause of death was either homicide by asphyxiation, accidental from the ingestion of drugs or a combination of the two, according to the medical examiner.

Arnold-Boesigner and Van Duyn were involved in a romantic relationship with a history of abuse, a source reported. Investigators believe she was likely killed on or about Nov. 15, when cell records show the couple near the U-Haul facility. Her passcode was used to enter the property at 11:10 a.m. and again later, after her debit card has been used at a nearby Home Depot to purchase heavy-duty garbage bags, duct tape and odor-eliminating products.

Arnold-Boesigner’s pickup truck was captured on camera the same day, with Van Duyn driving. Over the next several weeks, Van Duyn reportedly used her debit card, and her cell phone was shown as active and near Van Duyn's mobile device.

In December, Van Duyn used Arnold-Boesiger’s pickup to abduct his own daughter and drive her from Wisconsin to Indiana. When police apprehended him for this crime, they discovered items belonging to Arnold-Boesiger inside the vehicle. That evidence led them to the storage unit where her body was found.

3/5/21 – The body of a 33-year-old woman was discovered on Tuesday inside a self-storage unit at a U-Haul facility in Roscoe, Ill. The McHenry County Sheriff’s Office obtained a probable-cause warrant to search the property, where investigators found Michelle Arnold-Boesigner. A resident of Harvard, Ill., she was reported missing on Jan. 3 to the Holiday Hills Police Department, according to a source.

At least six police vehicles responded to the scene on March 2. Arnold-Boesigner was identified on Thursday. No additional details have been reported, including whether police suspect foul play. Investigators indicated there isn’t any threat to the community, sources reported.

The Roscoe Police Department and Winnebago County Sheriff’s Office are also assisting in the ongoing investigation.

Established in 1945, Phoenix-based U-Haul International Inc. owns or manages more than 1,200 self-storage facilities across North America. Its portfolio comprises more than 68 million square feet

Sources:
MyStateline.com, Body Found at Roscoe U-Haul Storage Facility
MyStateline.com, Body Found in Roscoe U-Haul Facility Identified as Harvard Woman
WIFR, Death Investigation Underway in Roscoe
WIFR, Wis. Man Charged for Murder of Michelle Arnold-Boesiger, Abducted Own DaughterMy Stateline, Man Sentenced to 28 Years for Killing Girlfriend, Leaving Body in Winnebago County Storage Unit
Lake & McHenry County Scanner, 28 Years in Prison for Man Convicted of Killing McHenry County Woman Found Dead in Storage Locker
Northwest Herald, Man Charged in Marengo Woman’s Murder Appears in Winnebago County Bond Court