A man has pleaded guilty to charges he held his sister captive in filthy conditions inside their Connecticut home for years.

Fifty-nine-year-old Arthur Gauvin pleaded guilty Tuesday in Milford Superior Court to abuse and cruelty charges. The plea deal calls for him to serve five to 10 years in prison. Sentencing is set for July 9.

Police say they found Gauvin's sister covered in human waste inside her and her brother's home in Seymour last year. Authorities said there was a lock on the outside of her bedroom door, and the room's windows were blacked out with paint. Police say the sister was suffering from diabetes and dementia.

Prosecutors say the woman is doing well now.

Gauvin remains free on bail but is wearing an ankle bracelet for monitoring.