On December 3, 1998, Wisconsin police were called to the home of Mark and Julie Jensen. Mark said he found his wife dead in her bed. Initially, police suspected Julie died by suicide, but a letter she had previously written expressed her suspicion that Mark might kill her. A series of toxicology tests revealed there was small amount of ethylene glycol, the main ingredient in antifreeze, in Julie’s stomach. “48 Hours" correspondent Erin Moriarty reports. This classic "48 Hours" episode last aired on 9/6/2008. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+. To learn more about listener data and our privacy practices visit: https://www.audacyinc.com/privacy-policy Learn more about your ad choices. Visit https://podcastchoices.com/adchoices
Chapter 1: What happened to Julie Jensen on December 3, 1998?
Collier Boyle was lying awake at night when he heard something horrible. It was going through your mind at that time.
Where's my mother? She would never, ever leave her children.
His best hope? To team up with a middle-aged detective with a chip on his shoulder. I got a partner now. Somebody who's going to help me find out what happened to my mother.
His whole life is a lie.
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I'm continuing to tell my sister's story and to memorialize her with music. She was a really exceptionally warm and sincere person.
She liked having us brothers. She wanted nothing more in life than to just have a family and be a mother.
Mark took joy in everything. He was just such a great personality. Julie was the first real girlfriend. Mark was really enamored with Julie. You could just see it. He loved her a lot. I'm Florence Jensen, Mark's mother.
Julie and Mark were a model couple.
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Chapter 2: Who was Julie Jensen and what was her family life like?
Two months later, Julie said Mark was acting suspiciously, searching the web for poisons and writing bizarre notes, which Julie photographed.
She started saying things like, I found some notes next to his computer that had lists of drugs and syringes and other paraphernalia that I think might be something he would try to use on me. Was there a side of you thinking she can't be serious? I didn't know what to think. I was worried sick about her. When Julie said that her husband's looking up poisons, what did you think?
To tell you the truth, I didn't know what to think of that. But by early November, Margaret and Ted had become very concerned about Julie.
She got very sick.
And what did she say?
He's trying to kill me some way, somehow.
My husband said, take the boys. Leave. You need the money. I give you money. And she's like, no.
And Therese suggested Julie go to a woman's shelter. Again, she said no.
He will find out where it is. And he's also always said to me that if I ever tried to leave him, he would make it look like I was crazy and I wouldn't get to see the children.
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