Police have arrested a Wisconsin woman in connection to a 2002 cold-case murder of her best friend who was stabbed to death in Indiana.
Holly Boisvert, now aged 33, was 15 years old when investigators say she knifed 17-year-old Stacy DeGrandchamp in Fort Wayne on August 15, 2002.
Boisvert's arrest last week capped off a year-long investigation, which entailed reviewing evidence, conducting forensic testing and re-interviewing witnesses in multiple states.
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Holly Boisvert, 33, from Wisconsin (left), has been charged with murder in the August 2002 stabbing of her best friend, 17-year-old Stacy DeGrandchamp (right), in Indiana

Witnesses said Boisvert and DeGrandchamp camp to blows over a boy in this backyard in Fort Wayne, Indiana, on August 15, 2002

DeGrandchamp was found by police bleeding in the driveway after suffering knife wounds
Boisvert was taken into custody in Fond Du Lac, Wisconsin, on Tuesday, and then extradited to Indiana to face a count of murder, reported WPTA21.According to court filings, Boisvert admitted to the stabbing during an interview with detectives last year.
'I think I killed my best friend,' she was quoted as tearfully telling police.
Boisvert allegedly added that DeGrandchamp would still be alive today if only she 'just ad just walked away and not turned around to fight.’
It is believed that Boisvert got into a fight with DeGrandchamp over a boy in the backyard of a home on Guthrie Street, reported the station WANE.
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Boisvert is pictured being taken into custody in Fond du Lac, Wisconsin, on Tuesday
According to a probable cause affidavit, a witness told police that on the night of the attack, Boisvert said that 'DeGrandchamp is going to take an [expletive] whipping tonight,' then got into an argument with her friend

Boisvert initially denied being in possession of a knife and speculated that DeGrandchamp got hurt falling onto something, but she made a confession last year
The verbal dispute escalated to a catfight, with Boisvert and DeGrandchamp wrestling of the ground and pulling on each other's hair.
A friend eventually helped DeGrandchamp to her feet, revealing a bloodstain on her shirt.
The 15-year-old managed to take a few steps before collapsing mortally wounded in the driveway.
During a police interview in September 2002, Boisvert told detectives that she and her friend got into a shouting match after she overheard DeGrandchamp talking about another friend of hers, which 'set her off.'
She said that she pushed the victim and speculated that she got injured when she landed onto recycle bins. Boisvert at the time denied having a knife.

DeGrandchamp, described as athletic and friendly, was a rising high school senior who had already applied to Ball State University

DeGrandcahmp's cousins Tiffany Brubaker (left) and Jamie McMillen (right) rejoiced hearing of Boisvert's arrest.
A witness told police in 2003 that a few days after the stabbing, Boisvert confided in him that she did have a knife on her on August 15.
The witness also told detectives that Boisvert washed her hands after the deadly scuffle and placed the knife on or near a car that was parked in front of the house.
When interviewed in December 2019, Boisvert reportedly handed over to the police the knife she had in her possession her on the day of her friend's murder.
A pathologist who reviewed the original crime scene photos, DeGrandchamp's autopsy images and photos of Boisvert's knife concluded that it was consistent with the murder weapon.
DeGrandcahmp's cousins Tiffany Brubaker and Jamie McMillen rejoiced hearing of Boisvert's arrest.
'To get that phone call, to hear the detective say that "We got her," it's just an amazing, amazing feeling,' McMillen told WANE.
DeGrandchamp, described as athletic and friendly, was a rising high school senior who had already applied to Ball State University, where she planned to major in computer programming. She was an only child in her family.
Boisvert is scheduled to make her initial court appearance in Fort Wayne later today, which will be closed to the public due to coronavirus concerns.
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