The body of 49-year-old Lisa Schaefer was found in the basement of her own house.
Her boyfriend Michael Paul was arrested for 1st degree reckless homicide and hiding a corpse.
Janesville police say Schaefer was a victim of a domestic abuse related homicide, but are waiting for an autopsy report to determine the exact cause of death.
Schaefer lived in the house with Paul and another man. The other man was out of the country at the time.
Schaefer worked at the local Wal-Mart and had been seeing Paul for 2 years.
Paul is at the Rock