Martha Southwick, 75, killed; Chasity Montavo, 41, and 1 other person critical after head-on chain-reaction crash caused by semi on I-70 in Indianapolis, Indiana

Police believe Martha Southwick, 75, of Terre Haute, was driving a Dodge Caravan when a semi hit her from behind. She overcorrected, crossing the grass median and hitting an eastbound Chevrolet car head-on. Southwick, the only person in the van, was pronounced dead at the scene. The driver of the car, Chasity Montavo, 41, of Greenwood, and a passenger in the front seat were transported to Methodist Hospital in critical condition. The driver of the semi did not stop.

State Police looking for driver involved in fatal I-70 crash Posted: Updated: Indiana State Police are seeking the public's help in finding a commercial vehicle involved in a deadly weekend crash along Interstate 70 in Indianapolis. Saturday when an unknown commercial vehicle rear-ended her minivan, sending it across I-70's grassy median before it collided head-on with an oncoming car.      Myers says it's unknown whether a semitrailer, dump truck or box truck made the initial contact with Southwick's vehicle. Rich Myers tells the Tribune-Star there is no video from highway department cameras showing the crash. He says police are hoping someone who witnessed the crash near the Interstate 465 interchange just east of the Indianapolis International Airport exit comes forward with information.