The Kankakee County Sheriff's Office says Kamron T. Taylor fled from the Jerome Combs Detention Center at about 3 a.m. Wednesday.
Authorities didn't learn of the escape until about 30 minutes later when jail staff found the wounded officer, who is hospitalized in intensive care.
The Kankakee County Sheriff's Office also issued an endangered missing person advisory around 2:30 p.m. Wednesday for Savannah Bell, a 15-year-old female that they believed to be in the company of Taylor. That alert was later cancelled after Bell was found safe.
Chief Deputy Ken McCabe says Taylor is considered armed and dangerous.
He fled in the correctional officer's brown Chevrolet Equinox, which was found abandoned at about 8:30 a.m. in a Kankakee residential neighborhood.
Dogs were called in to help in the search, but Bukowski says it's not clear whether Taylor continued from there on foot or whether someone picked him up in another vehicle.
The U.S. Marshals Service's Fugitive Task Force and local law enforcement agencies are participating in the manhunt.
The fugitive—who weighs about 170 pounds and stands 5 feet, 9 inches tall—is wanted for aggravated battery to a correctional officer as well as escape, the Sheriff's Office said on its website.
A $1,000 cash reward is being offered for any information that leads to Taylor's apprehension. Anyone with information about the whereabouts of Savannah Bell or Kamron Taylor is advised to call 9-1-1.
Taylor, now 23, was convicted of murdering Nelson Williams Jr. in front of his Kanakee home in 2013.
Kankakee is located roughly 250 miles from St. Louis.