hannah wilson , 22 , was last seen in bloomington at about 1 am on friday .
a missing persons report regarding the gamma phi beta sorority member was filed friday afternoon .
police found wilson 's body in needmore , more than 20 miles from campus .
she died after being struck in the back of the head multiple times by an unknown object .
daniel messel , 49 , of bloomington was arrested and is facing a preliminary charge of murder .
the connection between messel and wilson has not been revealed by police .