Updated: 3:43 p.m. December 6, 2017

MENOMONEE FALLS, Wis. (CBS 58) -- Boundary Road has re-opened to traffic.

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Posted: 12:54 p.m. December 6, 2017

MENOMONEE FALLS, Wis. (CBS 58) -- Emergency officials in Menomonee Falls responded to a fatal crash Wednesday morning just after 9:30 a.m. on Boundary Road south of County Line Road / County Trunk Highway Q.   

The investigation revealed that a semi driving south collided with a SUV driving north of the two lane road.

One person in the SUV was pronounced dead on the scene and another person was taken by Flight for Life with serious injuries. It is unknown which person was the driver.

The driver of the semi was not injured.

Authorities expect the full investigation to take hours and Boundary Road will be closed until the evening on Wednesday, December 6.