The crash happened near Owatonna Tuesday morning.
One crash happened in Steele County and the other in Anoka County.
The suspect is accused of using brass knuckles with knives attached to stab the victim.
The big rig was stolen out of Pine County and crashed in Steele County.
The lawman's wife was waiting to turn left when she was hit on Hwy. 14.
A man from New Richland was killed in the crash.
It happened south of Owatonna at the Straight River.