The victim's identity will not be released until mid-morning today, the Green County Sheriff's Office said.
The truck Davis was driving was northbound on Highway 69 a half mile north of Monticello shortly after 2 p.m. when it crossed the centerline and struck the woman's vehicle head-on, according to Green County authorities.
The woman was pronounced dead at the scene, according to Green County authorities. Davis was transported to University Hospital, Madison, by helicopter and admitted with serious injuries.
There was no indication that alcohol was a contributing factor, Sheriff Jeff Skatrud said. The crash remains under investigation.