Sadler, 24, of Grand Rapids, Michigan, was driving. He and Foltz, 22, of Greeley, Nebraska, both died at the scene. Delahoussaye, 21, of New Iberia, Louisiana, was also a passenger. He was treated at Waukesha Memorial Hospital and released. His injuries were minor and he is scheduled to return home Monday, according to a statement from LSU.
Police said the accident remains under investigation, according to the Lansing State Journal.
Dan Tracy with Kohl's Kicking said the camp ended early Sunday after an announcement about the deaths.
A statement from kicking camp director Jamie Kohl said the staff was mourning with the players' families and football programs.
The University of Nebraska said Sunday coach Mike Riley and student-athletes Tommy Armstrong, Josh Banderas and Jordan Westerkamp will not participate in Big Ten Media Day scheduled for Monday and Tuesday in Chicago.
"Sam was universally loved and respected by everyone he touched and on whom he had a positive influence each and every day," Riley said in a release. "The young men in our football program are hurting but I know that their strength of character and resolve will bring us together and we will honor Sam every day moving forward."
Foltz was a three-year starter for the Cornhuskers. He was the Big Ten's punter of the year last year. Foltz graduated from Nebraska with a degree in agronomy in May.
Several hundred friends and teammates gathered outside Memorial Stadium in Lincoln, Nebraska, Sunday afternoon to remember him.
Sadler, a four-year starter and four-time academic All-American at Michigan State, was known for his wit. He finished his college playing career after the 2014 season.
Michigan State coach Mark Dantonio confirmed the loss Sunday afternoon.
"Mike impacted so many people not only as a football player, but also from an academic standpoint and in the community as well," Dantonio said in a statement. "The world has lost a rising star who dreamed big and was accomplishing those dreams, one after another. He was one of those people that brightened your day."
The Associated Press contributed to this report.