The 23-year-old student was found dead inside her locked bedroom at her off-campus apartment in Ypsilanti Tuesday after her roommates said they hadn't seen her in a couple of days and notified authorities.
A Washtenaw County medical examiner's autopsy report said there were no outward signs of trauma, but toxicology results were not in and the cause of death had yet to be determined, The Ypsilanti Courier reported.
The Ypsilanti Police Department said in a release there were indicators of possible foul play and her death was being investigated as an apparent homicide until proven otherwise, the Courier said.
Ypsilanti police said investigators were in contact with Niswender's family and were following up on a number of leads.
Niswender graduated from Monroe High School in 2008 and Monroe Community College in 2011, the Detroit Free Press said.
Niswender was a junior with a double major in communications and electronic media and film at EMU. She also was a sales associate at a Walmart store.
She is survived by her parents and twin sister Jennifer.