DETROIT -- An elderly woman lived for a year with her mummified sister in a home on Detroit’s east side, police said.

Authorities made the discovery Wednesday after neighbors expressed worries over not seeing the sisters in some time.

Investigators found the dead woman sitting in a chair inside the house on Buffalo Street near Seven Mile and Mound roads, police said.

Police said the dead woman had been there for at least a year and that her corpse had mummified.

The surviving sister may have mental problems, police said, and she is receiving treatment while the investigation continues.