Police have announced murder charges against a man accused of fatally shooting a woman, who was an endocrinology doctor, during a domestic incident in Barrington Sunday evening.
William R. Zientek, 46, of the 400 block of West Russell Street in Barrington, was charged with one count of first-degree murder, a Class M felony.
The Barrington Police Department and Barrington Fire Department responded around 5:40 p.m. Sunday to The Arbors at Barrington Apartments in the 400 block of West Russell Street for a report of a shooting.
Police officers arrived to find a woman with an apparent gunshot wound.
Lake County Coroner Jennifer Banek identified the woman as Olga Duchon, 42, of Vernon Hills.
The Barrington Fire Department provided emergency treatment to Duchon.
Paramedics transported Duchon to Advocate Good Shepherd Hospital in Barrington where she was pronounced dead, police officials said.
Banek said an autopsy performed Monday on Duchon showed she died from a gunshot wound to the chest.
Police officials said the incident was a domestic-related incident between family members.
A bystander reported seeing officers take a person into custody at the scene, which was located on the corner of Lageshulte Street and Russell Street.
Detectives from the Barrington Police Department and the Major Case Assistance Team (MCAT) responded to the scene.
Officials said Tuesday afternoon that both Barrington Police and MCAT completed a “thorough investigation” of the incident.
The Cook County State’s Attorney’s Office subsequently approved the first-degree murder charge against Zientek.
Zientek will be transported to the Cook County 3rd District Courthouse in Rolling Meadows on Wednesday for his detention hearing.
Duchon was a doctor in endocrinology affiliated with Northwestern Medicine as a member of the organization’s medical staff treating patients independently.
She was also an assistant professor at Rosalind Franklin University of Medicine and Science.
“We are learning about this tragic event in real time and we are devasted to hear this news. Our sympathies go out to her family during this difficult time,” a spokesperson for Northwestern Medicine said.
Maria Hrycelak, the President of the Ukrainian Medical Association of North America Foundation, told news outlets that Duchon had been the featured speaker during a lecture on obesity management through the use of weight loss medication.
The lecture was held in Wheeling on Sunday afternoon, just hours before her death.
Hrycelak described Duchon as “well-trained” and “smart.”
Police said there was no threat to the public following the shooting.