Two Amish people were sent to the hospital following a crash with a truck in Montcalm County.
It happened on M-91 north of Briggs Road in Pine Township.
Michigan State Police Troopers say a pickup truck traveling south bound on M-91 crossed the centerline and struck a northbound Amish buggy.
The driver of the buggy was taken to the hospital by Aero Med in serious life-threatening condition, his passenger was transported to the hospital by ambulance with serious injuries.
The driver of the pickup truck was transported to the hospital with non-life threatening injuries.
The horse was killed in the crash.
The accident remains under investigation.