Killed Jane Doe, whose body was discovered in a corn field in Raymond, Wisconsin, in 1999.
According to a criminal complaint, her body "appears slightly malnourished" and "has several suspicious signs, burns, burns abrasions and tears everywhere. "She had blunt head trauma, death ribs after death, a broken nose, bruising and swelling from infection.
Her cause of death was set for the murder of "sepsis pneumonia as a result of an infection from injuries from chronic abuse," according to a criminal complaint.
Earlier in the 1990s, Johnson was about 18 years old, cognitively impaired and alone when he went to seek help at a medical clinic in McHenry, Illinois, the sheriff said. There, she met Linda LaRoche, a registered nurse who recognized her disability and accepted her at her home, Schmilling said.
Johnson, who has never disappeared as missing, has lived in McHenry with LaRoche for the last five years of his life, Schmilling said.
"There she suffered a long and horrific violence by Linda LaRoche," he said.
Police announce the identity of 23-year-old Peggy Lynn Johnson, whose body was discovered in July 1999 in Raymond, Wisc.
But Jane Doe, the suspect in the case, has been unknown for two decades. Then this September, Racine County investigators were advised that LaRoche "tells people she killed a woman when she was living in Illinois," according to a criminal complaint.
Investigators spoke with one of Laroche's children and learned that Laroche had taken Johnson to work as a nanny and housekeeper in exchange for a place to live, the criminal complaint says.
Investigators learned that "Laroche was verbally and emotionally abusive" to Johnson, "at times screaming at her like an animal," the criminal complaint states.
Laroche allegedly hit her on the head and face and allegedly stabbed her on the head once with a pitchfork, according to the criminal complaint.
"At times when she is not working for the family, Peggy will be forced to sleep and stay in a crawl space," the criminal complaint states.
Larochet's ex-husband spoke to investigators this month and recalled that the last time he saw Johnson at their home, he found her "lying on the ground lifeless," according to a criminal complaint.
He told investigators that his wife told him Johnson was "overkill and she would take her from their house so they would not be involved," the criminal complaint says.
Investigators interviewed Linda LaRoche this week, during which she admitted to abusing Johnson. But "Laroche claimed that Peggy would steal, people come to see her at their house, and that she would come within range of their house to steal drugs," according to the criminal complaint.
LaRoche said that Johnson was holding pills one day before he fell ill. Laroche, a registered nurse, told investigators she "thought about calling an ambulance but did not," the criminal complaint said.
LaRoche said Johnson eventually woke up and she "decided she could no longer deal with Peggy and took her to a telephone booth at a nearby gas station," the complaint said. LaRoche told investigators that Johnson called her grandmother and she then "turned [her] to her grandmother," the complaint said.
"When confronted with the fact that Peggy's grandmother had been interviewed by police and said she had never met Laroche or her husband, Laroche later changed her story and admitted that she was not sure who is the person Peggy left with, "the complaint said.
In another interview this week, Laroche changed his story by admitting he drove Johnson to Wisconsin, the complaint said.
"Laroche acknowledged that she had let Peggy out of the car in a rural area and left her by the side of the road," the complaint states. "Laroche claims that Peggy was not injured at all when she was stabbed and that something must have happened to her after she was stabbed."
Laroche was rented Tuesday in Florida for the murder of Johnson, the sheriff said. She has given up extradition and will soon be transported to Wisconsin, he said.
The Johnson family was discovered and her identity confirmed by family DNA testing, according to a criminal complaint. An agreement will be made to allow Johnson to rest as his true identity and to be buried with his mother, the sheriff said.