At a little before noon on Saturday, Treu struck and killed three girl scouts and one adult who was supervising the girls as the picked up trash by the side of a country road.
Three young Girl Scouts and a mother were killed Saturday while cleaning garbage out of a ditch in Lake Hallie, Wisconsin.
The driver, identified as 21-year-old Colton Treu, fled the scene but later turned himself in to police.
The group of seven girls and five parents had "highly visible" green safety vests on at the time, police said in a statement. A third girl was rushed to the hospital and died there.
Lake Hallie Police say the truck Treu was driving veered out of it's lane, crossed the center line and left the road entirely when it traveled into a ditch, hitting 4 children and 1 adult.
It is expected the 21-year-old will be charged with four counts of homicide through the negligent use of a vehicle.
The reason for the crash is not clear and Mr Sokup said Treu had been approaching a hill and there were no blind spots.
Colten Treu, 21, who is also from Chippewa Falls, later surrendered to police, authorities said.
"Our hearts are broken for the girls and families of the Girl Scouts of the Northwestern Great Lakes", Sylvia Acevedo, CEO of Girl Scouts of the United States of America, said in a statement Sunday.
The deceased woman was identified as the mother of one of the dead girls in a report from local broadcaster WEAU News, however the names of the victims have yet to be released.
Hundreds of community members gathered outside an elementary school in Wisconsin to remember three Girl Scouts and a parent who were killed in a hit-and-run crash.
"We're going through a storm as girl scouts and as a community", said Chippewa Falls mother and former Girl Scout, Tricia Voigt. One other girl who was hit survived and was in critical condition Saturday night. "Girl Scouts everywhere stand with you during this hard time".
The girls were members of Troop 3055 and were fourth-grade students in nearby Chippewa Falls, which is about 90 miles (145 kilometers) east of Minneapolis. Two of the girls, and a woman who was supervising the group, were pronounced dead at the scene.
Judy Schneider says the deaths of her daughter and granddaughter Saturday morning in Lake Hallie are "still not real for any of us".
The Chippewa Falls Police Department in a statement posted to Facebook Saturday evening called it a "truly horrific incident" and extended its condolences to the victims and their families. Other members of the troop were picking up trash from the opposite shoulder. Sergeant Dan Sokup says one victim was air lifted to the hospital and one victim was taken by ambulance.
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