Prospect Heights murder-suicide victim killed by her boss, police say

A 42-year-old woman shot and killed at her Prospect Heights home Monday worked for the man who police say murdered her and then turned the gun on himself.

Authorities say Dong (Donna) Yu worked as a waitress for her killer, Keon Suk Oh, at his Tatami Japanese Restaurant, 1859 Waukegan Road in Glenview. Employees at the restaurant declined Tuesday to comment on either Yu or Oh.

Prospect Heights police said Yu, a mother of two, was found shot to death shortly after 3:30 p.m. Monday by officers responding to numerous 911 calls from the Lake Run Condominiums on the 0-100 block of Old Willow Road.

The 911 calls, police said, reported “a verbal altercation and shouting,” “shots fired,” and “a woman reporting that she was being attacked.”

Prospect Heights Police Chief Jamie Dunne said it appears one of the 911 calls was made by Yu before she was killed.

Oh, 46, with a last known address on the 1600 block of North Cypress Pointe Drive in Vernon Hills, was found dead in the same fourth-floor hallway as Yu. A Ruger .40-caliber semiautomatic handgun also was recovered at the scene.

Dunne said Yu was recently divorced and had lived alone in the condominium complex, having moved there about a year ago from Lake Villa.

Authorities declined to say whether they were aware of any relationship outside of work between Yu and Oh.

A Cook County medical examiner’s office spokeswoman said autopsies performed Tuesday determined Yu’s death was a homicide caused by multiple gunshot wounds. Oh died of a self-inflicted gunshot wound to the head, she said.

Oh had no serious criminal history, and only a few traffic tickets on his record before Monday’s shootings, a search of Lake and Cook county court records shows.

Police continued to investigate the shootings Tuesday and were working with the complex’s private security guards to obtain surveillance footage.

“We are 100 percent confident that there is no threat to the community and that the situation is secure,” Dunne said. “The police department needs time to continue the investigation and gather more information.”