Heather Pressdee, 41, pleaded guilty to the charges, which included three counts of first-degree murder and 19 counts of attempt to commit murder.

The health system employs 40,000 people and cares for more than 12 million patients in eight states.

The 61-year-old physician is currently in jail. He was previously in the news for allegedly implanting stents that were not medically necessary, agreeing to pay a hefty sum to settle.

A lawsuit filed in federal court claims the state is detaining mentally ill and disabled patients without due process or proper access to treatment.

A new lawsuit claims a 15-year-old girl was used as an enforcer of bad behavior at a psychiatric facility in Michigan, resulting in her severely beating a 10-year-old boy.

The health system, meanwhile, said it stands by its decision to terminate the interventional cardiologist after working with him for several years. 

UnitedHealth CEO Andrew Witty told the Senate Finance Committee that systems have been rebuilt “from scratch” in light of the oversight.

The case dates to June 2019 when whistleblower and Arizona IT executive Eric Stenson first filed suit against Tucson-based Radiology Limited.