On Saturday afternoon, he stole a gun from the correctional officer who escorted him and held a female nurse as hostage inside the hospital for several hours.
Gengler said the hospital's emergency room was quickly cleared, but patients elsewhere in the hospital weren't evacuated.
Officers shot and killed an armed jail inmate and freed his hostage at hospital in northern IL on Saturday, several hours after the inmate stole a gun from the correction's officer guarding him, authorities said.
The inmate was believed to still be holding the gun on a female hospital employee at about 4pm local time, with the hospital placed on lock down.
The lockdown was lifted early Saturday evening, as the hospital began to take walk-in patients at 6 p.m., with ambulance drop-off scheduled to resume at 8 p.m. Pat Gengler says police had been negotiating with 21-year-old Tywon Salters, but when negotiations broke down the SWAT team went in.
The second nurse appeared to be physically OK, Gengler said.
SWAT teams and crisis negotiators were on the scene.
Kane County Sheriff's Office Lt.
Geneva is a far west suburb of Chicago.
The Illinois State Police is conducting the investigation, which remains ongoing.
She said that the hospital has policies and trainings in place for emergency situations such as these.
Kim Waterman, media relations specialist for Northwestern Medicine, said the hospital was extremely grateful for the police response and ability to keep employees and patients safe.
"We do a lot of training for incidents like this", she said.