Al Filan, 62, was chair of the Business Department and taught at Brother Rice for more than 39 years, according to the school.
Filan was found Tuesday morning after he didn't show up for work, according to the Chicago Tribune.
Orland Park police Cmdr. John Keating told Sun-Times Media the South Suburban Major Crimes Task Force has been called in: “We don’t want to leave any stone unturned if there’s any possibility (of) foul play. That’s why I made the call to request assistance from the task force. They’ve handled homicides in the south suburbs for many years, but at this time I can’t confirm that (it is a homicide). It’s still classified a death investigation at this point until the medical examiner tells us otherwise.”
Brother Rice posted a notice on its website saying information about funeral arrangements would be posted as soon as they are received.
An autopsy will be conducted Wednesday.
Filan once helped coach girls soccer at Andrew High School in Tinley Park.
“He knew more soccer than most people ever knew, and the kids loved him,” Andrew athletic director Rich Piatchek told the Sun-Times. “He was known by everybody in the soccer community as a guru. He was a very bright person. He knew his stuff.”