A cause of death has been determined for the college student who disappeared from a frat party.
University of Michigan student Lucas Mattson was last seen amid frigid temperatures on Jan. 23. He was found dead the next day. Mattson, 19, was last seen walking alone.
“The nearly 20-hour search effort to locate him took place in extreme cold conditions and included officers from AAPD and University of Michigan Division of Public Safety and Security, as well as the University of Michigan Police Department Drone Unit,” the AAPD said in its statement…