The Illinois State Police is investigating a fatal crash from Sunday.  ISP responded to investigate an incident that took place on I-55 mile marker 73 in Montgomery County Sunday morning at 12:32.  A Silver Chevrolet driven by 36 year old Dannean Royston of St. Louis was traveling northbound I-55 in the southbound lanes.  A silver Nissan driven by 54 year old Cheryl True of Maryville was traveling southbound in the southbound lanes.  The Chevrolet hit the Nissan head on. This caused the Nissan to spin around side swiping a Freightliner and a black Nissan.  All units came to a stop with the silver Nissan sitting in the middle of the southbound lanes.  A Megabus loaded with 54 passengers than struck the silver Nissan.  Both drivers, Royston and True, were pronounced dead by the Montgomery County Coroner. The driver of the Megabus, 60 year old Kermit Wilmington of Chicago, went to the hospital with serious injuries. The Megabus also had 5 passengers that were transported to the hospital with minor injuries. The ISP reconstruction unit is continuing the investigation at this time.