Many people from Illinois, Indiana, Wisconsin and Ohio around midnight of March 26, 2003 saw a bright fireball. Several stones fell near the village of Park Forest. At least two houses in Park Forest were struck, as well the Fire Station. In the following days many stones or fragments of stones were recovered in the area. The total mass recovered is above 18 kilograms (40 lb) and the single largest stone is about 3 kilograms (6.6 lb).
Most stones are partly or full fusion-crusted. The interior shows brecciated texture and angular clasts. There are also dark veins and dark pockets, probably of impact melt origin. There are no visible chondrules. There is also abundant metal and troilite. Mean olivine composition Fa24.7, mean low-Ca pyroxene Fs20.7Wo1.6.
Several samples are conserved at the Field Museum of Natural History of Chicago and a large piece that fell through the kitchen ceiling of one Park Forest couple is periodically displayed at the Adler Planetarium.