The doctor had just given a presentation before he was shot dead in Barrington, Illinois

BARRINGTON, Ill. (CBS) — A respected suburban doctor was shot dead in a Barrington home last weekend, shortly after giving a presentation to a group of doctors.

Barrington police called the shooting where Dr. Olga Duchon died in a domestic incident.

On Sunday afternoon, the respected endocrinologist was the keynote speaker at a discussion with members of the Ukrainian Medical Association on weight loss medications.

“She is well educated. She was knowledgeable and friendly,” said Dr. Maria Hrycelak, president of the Ukrainian Medical Association of North America.

Hrycelak said she was at the lecture in Wheeling and said goodbye to Dr. around 4 p.m. Duchon

Barrington police said about an hour and a half later at 5:30 p.m., Duchon was shot in the chest at a home in the 400 block of West Russell Street in Barrington – at The Arbors at the Barrington apartment complex.

She was 42.

“It was just the shock,” Hrycelak said. “Oh my God, this young lady we talked to yesterday, I shook her hand, and now she’s gone.”

Dr. Duchon practiced privately from an office in Mundelein. Former patients such as Virginia Doucet said they saw Dr. Duchon will always be grateful.

“She treated me for years,” Doucet said. “I almost felt like my organs were shutting down, and she saw all the symptoms for what they were – instead of turning me away.”

Doucet said that Dr. Duchon “absolutely” saved her life.

“I could never repay her for what she did for my daughter and our family,” said Doucet’s mother, Allison Doucet.

Neighbors said Duchon had young children and toys were still visible outside Barrington’s home.

On Monday, Barrington police would not confirm whether anyone was in custody, but described the shooting as a “domestic-related incident between family members.”

“I cried. It’s so tragic, and the way it happened,” Virginia Doucet said. “She seemed so happy all the time, you know? And I never thought there was so much more that was so hard — and it’s just heartbreaking.”

Barrington police reiterated that there was no threat to the public and that this was a domestic incident, but so far they have not confirmed any information about the suspect.

Barrington police would only say that the investigation into the case continues with assistance from the Major Case Assistance Team.