A 44-year-old woman has reached a plea agreement with prosecutors after allegedly attacking and crushing her boyfriend with her body in Erie County, US.

Windi Thomas, who weighed 300 pounds (136.1 kilograms),  had attacked Keeno Butler, also 44 and weighing 120pounds (54.4 Kilograms), with a folding knife, struck him in the head with a table leg, before sitting on him during a confrontation at their east Erie residence in March.

Thomas pleaded guilty to 3rd-degree murder and faces a recommended sentence of 18-36 years. She will be sentenced on December 21.

Erie County Judge William R. Cunningham accepted the plea shortly before 9 a.m. Assistant Erie County District Attorney Jeremy Lightner dropped charges of aggravated assault, reckless endangerment and possession of the instrument of a crime in exchange for Thomas’ plea in the death of Butler.

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The recommended sentence of 18 to 36 years would cut two to four years from the maximum sentence of 20 to 40 years for third-degree murder, an unpremeditated killing with malice.

“It’s a good result based upon the facts of the case,” said Thomas’ court-appointed lawyer, Mark Del Duca, of Pittsburgh. 

“I think it’s fair for both sides.”

Sandra Butler, the victim’s sister, said she wanted to see Thomas serve more time than the agreed-upon sentence.

“I feel like she should have 40 or more,” Butler said. “She deserved life.”

Thomas also said she placed her head on the couch so a portion of her body would be on Butler’s head, police said. Investigators wrote in the affidavit of probable cause that Thomas weighs approximately 300 pounds and Butler weighed approximately 120 pounds.

Butler’s death was ruled a homicide “caused by respiratory insufficiency secondary to blunt force trauma to the neck and thoracic compression, exacerbated by blunt force trauma to the head,” according to the affidavit.

Police said Butler’s body was found on the living room floor at the residence after Thomas called 911 and reported she had killed an individual.

Thomas will remain in the Erie County Prison without bond while she awaits sentencing.

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Sandra Butler said her family is still struggling to cope with her brother’s death.

“My mother, she calls for him every night,” Butler said.