An Arizona nurse is maintaining her innocence after prosecutors allege she murdered a friend who wanted to end his life by drug-assisted suicide.

Kristie Jane Koepplin, 58, of Peoria, Ariz., pleaded not guilty in an Orange County, Calif., court Monday, two weeks after she was arrested in Arizona and extradited to face a felony murder charge in the death of 57-year-old Matthew Peter Sokalski. Koepplin was released from custody Monday after posting $1 million bail but can’t leave California or practice nursing as conditions of her release, according to Kimberly Edds, a spokeswoman for the Orange County District Attorney’s Office.

The prosecution and defense each provided few details in the murky case, and the criminal complaint remains under seal. Orange County officials did not immediately respond to The Washington Post’s request for additional records, including the incident report and coroner’s report for Sokalski’s death.

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In a brief statement Monday, Orange County District Attorney Todd Spitzer alleged that Koepplin helped Sokalski die in April 2018 by injecting him with drugs. The Orange County Sheriff’s Department opened an investigation into Sokalski’s death after his body was discovered by staff at a hotel in Mission Viejo, Calif.

“California’s right to die law strictly governs the conditions under which terminally ill adult patients with the capacity to make medical decisions can be prescribed an aid-in-dying medication,” Spitzer said in a statement. “That was not the case here. It is beyond disturbing that someone who is trained as a nurse to aid the sick and the dying would twist their duty to willingly end the life of another human being.”

Two months after Sokalski’s death, a California appeals court reinstated the state’s controversial right-to-die law, which lets terminally ill patients with fewer than six months to live request lethal drugs.

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Michael Guisti, Koepplin’s attorney, denies wrongdoing by his client and disputes the prosecutor’s allegation that Koepplin was even present at Sokalski’s death.

“I don’t believe she acquiesced to any request at all. If you look at the DA’s press statement, there’s a huge leap of faith — and almost nothing till we get to an assisted suicide accusation,” Guisti told The Post on Wednesday. “In this case, especially since it has that ‘angel of death’ aura around it, people are paying attention, [but] my client just didn’t do this.”

A relative of Sokalski did not immediately respond to requests for comment.

Guisti confirmed that Sokalski and Koepplin had been friends for several years and credited Sokalski for introducing Koepplin to her now-husband.

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Koepplin and her husband sold their home in California last year and moved to Peoria, according to Guisti.

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Guisti said that Koepplin was aware she had been under investigation for the past 16 months, but that her previous attorney in Arizona told her charges were unlikely. He said it was unclear why the Orange County District Attorney’s Office was pursuing Koepplin now. In criticizing the office for what he characterized as overly aggressive prosecution “and a rush to judgment,” Guisti invoked his former client, Michelle Hadley.

Hadley was framed and jailed for three months in a high-profile 2016 case in which Orange County prosecutors accused her of orchestrating an elaborate kidnapping and “rape fantasy” plot to endanger the woman who married her ex-fiance. Hadley was later exonerated by the same office; prosecutors ultimately charged the wife of Hadley’s ex-fiance with the scheme.

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“We have a newly elected DA, and he’s not going to let go of anything that has sizzle,” Guisti said.

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In response, a spokesperson from Spitzer’s office declined to comment on further details of the case but said via email: “We only file cases if we can prove the facts beyond a reasonable doubt in a court of law.”

Koepplin faces 25 years to life in prison if convicted. Her trial is slated for January.

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