OMAHA, Neb. (AP) — A federal appeals panel has upheld the dismissal of three companies in a wrongful death lawsuit filed by the estate of a Maryland family killed in a 2012 fiery crash on Interstate 80 in western Nebraska.

The lawsuit was filed by relatives of Christopher and Diana Schmidt. The Gaithersburg, Maryland, couple died along with their two young children and unborn son in Sept. 9, 2012 crash.

The Schmidts were in separate cars in standstill traffic after a crash that involved two semitrailers in Cheyenne County. They were then rear-ended by another semitrailer traveling about 75 mph.

The 8th U.S. Circuit Court of Appeals panel on Thursday upheld a lower judge’s dismissal against the two trucking companies and a trailer company involved in the initial crash.