US4 min(s) read
Published 08:46 02 May 2026 GMT
A simple screenshot from a Snapchat map ended up cracking open one of the most disturbing double-murder cases Wisconsin has ever seen.
And it was all because a young woman didn't quite trust her boyfriend.
Turns out, her instincts were spot on.
He'd done something far worse than cheat.
In July 2021, Bart and Krista Halderson, a couple from Windsor, Wisconsin, were reported missing by their 23-year-old son, Chandler Halderson. According to him, his parents had headed off to the family cabin for the Fourth of July weekend and never came back.
It was the kind of story that, on the surface, sounded like a tragic disappearance.
But almost immediately, things started to feel a bit off.
From the outside, the Haldersons looked like a picture-perfect family.
Bart and Krista were proud parents to two sons, Mitchell, 24, who worked in tech, and Chandler, who they believed was studying for an IT degree, living at home, and about to start a dream job at Elon Musk's SpaceX.
Spoiler: none of that was true.
When Dane County Sheriff's detectives Sabrina Sims and Brian Shunk started digging, the cracks in Chandler's story grew bigger by the day.
So they did what any good investigator does. They started talking to the people closest to him.
That included his girlfriend, Cathryn 'Cat' Mellender.
Cat handed over her phone and let detectives download her data.
As it happened, Chandler had cheated on her in the past, so she'd taken to keeping tabs on him through Snapchat.
Specifically, the app's Snap Map feature, which lets users see their friends' real-time location.
Early on July 3, right in the middle of the window when his parents had supposedly vanished, Cat opened the app and saw Chandler pinned at a remote spot near the Wisconsin River.
Something about it felt strange enough that she took a screenshot.
That screenshot would become one of the most damning pieces of evidence in the entire case.
When detectives went out to search the area Snapchat had placed Chandler in, they found human remains.
Those remains turned out to belong to his mother, Krista.
Bart's remains, meanwhile, were found at a farm roughly 20 miles from the family home.
The farm's owner told police she'd been startled to see Chandler walking out of her wood line.
When deputies searched, they found Bart, who had been shot at least twice in the back.
Chandler was charged with the murder of both of his parents, along with dismembering them and lying to police.
He pleaded not guilty.
But the question everyone wanted answered was simple. Why?
When the trial began in January 2022, prosecutors laid out a motive that was as bleak as it was sad.
Chandler, they said, had been living a years-long lie.
He hadn't been studying at college. He'd actually flunked out. The SpaceX job? Completely fabricated.
And on the day his parents were killed, his dad had reportedly arranged a meeting at the very college Chandler claimed to be attending, meaning the whole house of cards was about to collapse.
The evidence kept piling up.
A neighbour's security camera had captured a flickering light coming from a window in the Halderson home on the day prosecutors believe the couple were killed.
That flicker, they argued, was the family fireplace.
A forensic expert later testified that more than 200 human bone fragments had been recovered from inside it.
Chandler's defence team tried to argue that the prosecution simply didn't have enough to prove what really happened inside the home.
Chandler himself never took the stand.
The jury didn't need long. After just two hours of deliberation, they found him guilty on all charges.
At sentencing, Chandler addressed the judge to ask whether any lawyers in the room would be willing to take on his appeal.
He has since secured new representation and has filed one.
In April 2023, two of his convictions related to hiding his parents' remains were vacated on procedural grounds.
He continues to serve a life sentence with no possibility of parole for the murders and dismemberment of his mum and dad.
And it all started to unravel with one screenshot of a little Bitmoji on a map, taken by a girlfriend who just wanted to know where her boyfriend was.
