When MGM Grand Casino security and Detroit police entered hotel room 403 about 1 p.m. on May 29, they found the woman's lifeless body on the floor.

Tia Marie Vellucci, 27, of Davison in Genesee County, had suffered multiple stab wounds and had a bite mark on her nose, the Wayne County Prosecutor's Office says.

Daniel S. Michalak, 33, of St. Clair Shores in Macomb County, who's been described as Vellussi's boyfriend, is suspected of assaulting the woman prior to her death, but he's not been charged with murder.

A clear cause of death hasn't been determined.

"At this time the case remains under investigation awaiting the Wayne County Medical Examiner's report and other forensic testing," the Wayne County Prosecutor's Office said Friday, June 1.

The Wayne County Prosecutor's Office has charged Michalak with assault with intent to murder, assault with intent to maim and assault with intent to do great bodily harm.

He's expected to be arraigned Friday afternoon.

Police haven't said what information led them to check the room.