LA PORTE COUNTY, Ind. -- A driver was killed when their vehicle crashed into the rear of a semi on the shoulder of I94, according to Indiana State Police.

The crash happened in the westbound lanes near the 37 mile marker, 3 miles east of the Michigan City exit, just before 2 p.m. Wednesday.

The preliminary investigation revealed a Chevy Blazer struck the back of the semi, which was pulled off the roadway, onto the shoulder, reports said.

Police said they do not know what caused the driver of the Blazer to leave the roadway.

The identity of the driver is being withheld pending notification of next of kin.