A St. Paul man was killed Wednesday in a head-on collision in Decatur County.

Sgt. Stephen Wheeles, Indiana State Police Spokesman, says that at approximately 11:30 a.m., ISP troopers responded to a two-vehicle crash on Old US 421, also known as Michigan Road, south of County Road 520 West in Decatur County.

Wheeles says that the initial investigation indicated that an SUV, being driven by 41-year-old Melissa R. Kilian, of Shelbyville, was traveling south on Old US 421 near St. Paul. Kilian’s vehicle collided head on with a second SUV driven by 28-year-old Bruce W. Parish. Parish was pronounced deceased at the scene by the Decatur County Coroner’s Office. Kilian suffered possible life-threatening injuries and was flown to an Indianapolis hospital. Her condition is unknown at this time.

Investigators say that it is not yet known if drugs or alcohol played a role in the crash. They add that the cause of the crash in not yet known, as investigators are still piecing the details together.

ISP say that the crash closed Old US 421 for approximately two hours.