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A former respiratory therapist who admitted to killing two patients in 2002, and could be responsible for more suspicious deaths, was sentenced Friday to 18 years in prison.

Jennifer Hall, 42, who made headlines for wearing an "I don't f---ing care" hoodie in her booking photo, was initially charged in 2022 with first-degree murder but was permitted to plead guilty to reduced involuntary manslaughter counts as part of a plea deal.

The victims, Fern Franco, 75, and Coval Gann, 82, who died at Hedrick Medical Center in 2002, had insulin and a powerful muscle relaxant in their systems, which hadn't been prescribed by a doctor.

Hall also pleaded guilty to attempted assault for putting the same concoction in the "breathing treatment apparatus" of Norma Pearson, court records show.

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Jennifer Hall in hoodie in mug shot, left; close-up right

Former Missouri respiratory therapist Jennifer Hall was sentenced Friday to 18 years in prison for the 2022 poisoning deaths of two patients. She wore an 'I don't f---ing care' hoodie in her arrest photo. (Livingston County Sheriff's Office)

"A young and bright respiratory therapist had a dark and sinister need to artificially code patients," Livingston County Prosecuting Attorney Adam Warren said in a statement to Fox News Digital. "Those of us who contemplate what Jennifer Hall is capable of will sleep better at night." 

The victims were among nine patients who died at the Chillicothe, Missouri, facility under what court documents allege were "medically suspicious" circumstances when Hall worked there from December 2001 to the following May, when she was placed on leave.

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During those five months, cardiac arrest events, known as "code blues," spiked to 18, compared to an average of one a year before then.

Hospital staff grew suspicious, noting that Hall had access to the patients who suffered medical emergencies and deaths, according to court records.

Woman with blond hair in booking photo.

Respiratory therapist Jennifer Hall was sentenced Friday to nearly two decades behind bars for the poisoning deaths of two patients in 2002. (Johnson County Sheriff's Department via AP)

Despite the suspicions, Hall denied any wrongdoing and it took two decades for authorities to gather enough evidence to arrest her.

She told The Kansas City Star in 2015 "No, never," when asked whether she had harmed patients.

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"My name just gets thrown out there, and it's for horrifying reasons," she told the local newspaper.

The case was revived after an analysis of Franco's tissue samples revealed the presence of unprescribed and medically unnecessary drugs

Attorneys who represented victims' families pursued civil cases that helped investigators in their murder probe, Warren said.

Missouri hospital entrance

Hedrick Hospital in Chillicothe, Missouri, where respiratory therapist Jennifer Hall fatally poisoned two patients in 2002. Authorities suspect she may be behind as many as nine deaths during her five-month stint at the facility. (Google maps)

The respiratory therapist was previously convicted of setting a fire at another hospital but appealed the verdict and was acquitted at a second trial in 2001, LawandCrime reported.

Hall's attorney, Molly Hastings, didn't immediately return a request for comment.

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Hall's sentencing comes three days before British nurse Lucy Letby, 33, was hit with life behind bars for the murders of seven babies and the attempted murders of six others at a UK hospital. 

Letby was found guilty Friday, making her the country's most murderous child serial killer.