An Oklahoma woman has been sentenced to a lengthy prison term after she brutally murdered her 75-year-old mother using a portable vacuum cleaner and multiple knives. Following the attack, she was found washing dishes when police arrived.

Tracy Mannon, 53, received a 60-year prison sentence for the killing of her mother, Linda Barnes. In April, Mannon admitted to second-degree murder in Indian country. The U.S. Attorney’s Office for the Eastern District of Oklahoma handled the case because the crime happened on Choctaw Nation land, and both Mannon and her mother were members of the Cherokee Nation.

According to a criminal complaint, a concerned neighbor contacted the Wilburton Police Department around 4 p.m. on February 26, 2024. The neighbor reported hearing Mannon shouting at her mother before an unsettling silence followed.

Upon arrival, officers discovered no response at the front door and proceeded to the rear of the house. Peering through an open door, they found Barnes lying on the floor with severe injuries, including exposed organs and tissue. Barnes also suffered wounds to her face and arms. Medical personnel confirmed her death at the scene.

Inside, officers found Mannon at the kitchen sink, seemingly engaged in washing dishes. She was promptly arrested and confessed to the murder. Mannon admitted to using two knives and had intended to dismember her mother’s body with them, but found one knife too dull for the task. Additionally, she assaulted her mother with the vacuum cleaner.

In an attempt to conceal evidence, Mannon wrapped her blood-soaked clothing in a piece of carpet and hid them in her bedroom closet.

Barnes’ daughter and Mannon’s sister spoke at the sentencing hearing. Even at 75, the victim was “the life of the party” who loved playing games while displaying a competitive edge.

“She still was [at] game night, she would fight and fuss with us, argue over rules, try to cheat. That’s just who she was. And so much fun,” her daughter Melissa Junell told local CBS affiliate KOTV.

Junell said her sister has been violent for years and has always blamed mental health problems while not seeking treatment.

“She said that if she gets out, that she would take her meds and be responsible,” said Junell. “She said that she’s learned her lesson, which I don’t believe any of that.”

In her sentencing memorandum, Mannon’s attorneys said she was diagnosed with paranoid schizophrenia and bipolar disorder when she was in her mid-20s. She also was sexually assaulted multiple times, including once while she was in jail, which resulted in the birth of her daughter.

Mannon had been living with her mother and daughter while working at an ice factory, but she stopped taking her medication, which caused her mental health to become “increasingly uncontrolled.” She also started using drugs. On the morning of the murder she tried to quit her job and went home.

“By the afternoon she was delusional enough to kill her mother for no rational reason and in a way too bizarre to be anything but the product of her untreated mental disease,” her lawyers wrote. “Tracy killed her mother because she was having a delusion that her mother had been replaced by an identical robot which was going to detonate a large explosive device under the property.”

But Junell said mental health problems were no excuse to kill their mother.

“I know that she loves Tracy. But there is a measure of right and wrong. And today, the atrocious wrong that was committed against my mother by her own daughter, it was avenged,” Junell told KOTV.