Authorities were called to Morey Hall early Sunday after Grierson's roommate found him. Nelson says Grierson was dead when authorities arrived.
Nelson says there were no obvious signs of trauma, and it will be some time before toxicology results are completed. He says police are looking at everything, including natural causes, or whether alcohol or drugs were factors. Police are also talking with those who saw Grierson last.
Grierson is from Dassel. University spokeswoman Andrea Mikkelsen says he joined Winona State last fall as a freshman. He was studying mass communication.