SACO – A homeless woman, who had been beaten and left in a Saco motel room, has died at Maine Medical Center in Portland.

Stephen McCausland, spokesman for the Department of Public Safety, said 55-year-old Elizabeth Williams of Portland died Sunday afternoon.

The state Medical Examiner’s Office will perform an autopsy on Williams’ body on Monday, McCausland said.

“We are now looking to to the medical examiner for answers as to how she died,” McCausland said.

Williams was found badly injured by the cleaning staff at the Sunrise Motel on Route 1 in Saco on Saturday morning.

Williams was transported to Maine Medical Center where she remained in critical condition overnight. She passed away Sunday afternoon.

State and Saco police spent Saturday and most of the day Sunday investigating the assault.

A man, whom police have talked to, rented the motel room where Williams was found.

“We have talked to him and he has been cooperative,” McCausland said. No arrests have been made so far.

State police spent Sunday morning in Room 19 gathering evidence to determine how Williams was injured.

“We have gathered evidence from the room and we’ve secured it for the night,” McCausland said.

Motel manager Tony Singh said Williams had been banned from the motel premises for improper behavior but managed to get in.

The Sunrise Motel, which advertises itself as a residence inn, was the scene of three arrests on Jan. 3, 2011, after a 26-year-old told police she was being held against her will at the motel and forced into prostitution.

Lydia Ross Sholl, 26, of South Portland, Tiana Clark, 27, of Medford, Mass., and Wayne Hick of Scarborough were charged with kidnapping in that incident.