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[The Calculated Betrayal: The Murder of Julie Jensen]-[Secrets in Pleasant Prairie]

Dateline NBC · B2 · 2023-11-29

True crime
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📋 Summary

The Calculated Betrayal: The Murder of Julie Jensen

In December 1998, the quiet village of Pleasant Prairie, Wisconsin, was shaken by the suspicious death of 40-year-old Julie Jensen. What initially appeared to be a tragic, unexplained death would eventually unravel into a decades-long pursuit of justice, exposing a "very cold, calculating plan" orchestrated by her husband, Mark Jensen.

A Mysterious Death and Early Suspicions

When Mark Jensen called authorities to report his wife unresponsive on December 3, 1998, he claimed she had been suffering from depression and taking medication. However, responders were immediately struck by the "unusual circumstances." EMT Dave Wilkinson noted that Julie’s body was not in a peaceful, natural position, and there was a complete absence of the "obvious trauma" or drug paraphernalia one might associate with a violent death or an overdose.

District Attorney Bob Jambois, arriving at the scene, observed that Julie’s body was positioned in a way that suggested she had been "rolled into that position." The autopsy proved inconclusive, leaving the cause and manner of death as "to be determined." Despite the lack of an immediate smoking gun, investigators were deeply suspicious, especially after learning that Julie had previously feared for her life, even writing a letter stating, "If something happens to me, please hand this to the police."

The Web of Harassment and Deception

Before her death, Julie had lived in a state of terror. She reported repeated "harassing" phone calls and the discovery of "pornographic pictures" left in their garage and at Mark's office. For years, she suspected a former lover, Perry Tarika, but police eventually cleared him. It was only later that investigators discovered the harassment was a facade created by Mark himself to gaslight his wife. Forensics on the family computer revealed that the "Turtle" account used to send the offensive emails was actually "mjensen at execpc.com," proving Mark was the one who had been "humiliating and harassing his wife with pornography."

The Poisoning and the Computer Evidence

A breakthrough occurred when investigators analyzed the family computer, finding searches for "ethylene glycol," the primary component in antifreeze. A toxicology re-test confirmed traces of the poison in Julie’s system. Unlike a typical suicide where a victim ingests a large, fatal dose at once, the evidence suggested Julie had been slowly poisoned over several days. This discovery shifted the investigation from a potential suicide to a "cold-blooded, calculated" murder.

The Motive and the Admission

The motive became clear: Mark Jensen was having an affair with a coworker, Kelly Labonte. Within weeks of Julie’s death, Mark had moved his mistress into the family home and discarded Julie’s belongings in the trash. During an interrogation, Mark was confronted with Julie’s own letter—a voice from the grave—which identified him as the primary suspect. While he denied murder, he admitted to his role in the harassment, claiming he was "pissed off" about her past infidelity.

Justice Served: Two Trials, One Outcome

The case against Mark was bolstered by cellmates who testified that Mark had confessed to the details of the crime. According to one witness, Aaron Dillard, Mark admitted that after the antifreeze failed to kill her quickly enough before the boys arrived home, he "pushed her head into the pillow until she suffocated." This matched the physical evidence of Julie’s bent nose and unnatural position.

Despite a lengthy legal battle—including an overturned conviction due to the admissibility of Julie’s letter—Mark Jensen faced a second trial in 2023. Even without the letter, the mountain of evidence, including the computer forensics and jailhouse confessions, led to a second guilty verdict. Mark Jensen was sentenced to life without the possibility of parole. For Bob Jambois, the case was a 25-year quest to ensure that this "cold-blooded" man would spend the rest of his life behind bars, finally securing justice for the "innocent, kind, loving woman" that Julie Jensen was.

🎯Key Sentences

1
Is it a homicide?
2
We just didn't know.
3
She predicted her own death.
4
Only the eerie sound of a phone off the hook.
5
It appeared that he was distraught and concerned.
Expand All

📝Key Phrases

1
calculating plan
2
suspicious death
3
from her grave
4
off the hook
5
death investigation
Expand All

📖 Transcript

This was a very cold, calculating plan.
This innocent, kind, loving woman, those two boys were everything to her.
Just imagine all that Julie lost.
Julie Jetson was found covered with a blanket on the bed.
You've got a suspicious death.
Is it a homicide?

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